List of auxiliary Interstate Highways

Last updated

Dwight D. Eisenhower National System of Interstate and Defense Highways
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Highway shield for Interstate 295
Map of current Interstates.svg
Interstate Highways in the 48 contiguous states
System information
FormedJune 29, 1956 [1]
Highway names
Interstates Interstate X (I-X)
System links

The auxiliary Interstate Highways (also called three-digit Interstate Highways) are a supplemental subset of the freeways within the Interstate Highway System of the United States. Similar to the mainline Interstate Highways, these highways also meet all Interstate Highway Standards (with rare exceptions), they receive the same percentage of federal funding (90%), and they comply with other federal standards.

Interstate Highway System United States highway system

The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. Construction of the system was authorized by the Federal Aid Highway Act of 1956. The system extends throughout the contiguous United States and has routes in Hawaii, Alaska, and Puerto Rico.

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Contents

Auxiliary routes are generally classified as spur routes (which connect to the parent route at one end), bypasses (which connect to the parent route at both ends), or beltways, which form a complete circle intersecting the parent route at two locations. There are some routes which connect to the parent route at one end, but connect to another route at the other end; some states treat these as spurs while others treat them as bypasses.

Spur route

A spur route is a short road forming a branch from a longer, more important road such as a freeway, Interstate Highway, or motorway. A bypass or beltway should not be considered a true spur route as it typically reconnects with another or the same major road.

Bypass (road) road which bypasses something

A bypass is a road or highway that avoids or "bypasses" a built-up area, town, or village, to let through traffic flow without interference from local traffic, to reduce congestion in the built-up area, and to improve road safety. A bypass specifically designated for trucks may be called a truck route.

Ring road type of road

A ring road is a road or a series of connected roads encircling a town, city, or country. The most common purpose of a ring road is to assist in reducing traffic volumes in the urban centre, such as by offering an alternate route around the city for drivers who do not need to stop in the city core.

These shorter auxiliary routes branch off of main routes and are numbered based on the number of the parent route, such that all I-x95 routes are supplemental routes for I-95. While some exceptions do exist, generally spur routes are numbered with an odd hundreds digit (such as I-395), while bypasses and beltways are numbered with an even hundreds digit (such as I-695). Because longer interstates may have many such supplemental routes, the numbers may repeat from state to state along their route, but they will not repeat within a state.

Interstate 395 (Maine) highway in Maine

Interstate 395 (I-395) is a 4.99-mile-long (8.03 km) auxiliary Interstate Highway in the Bangor, Maine area. The western terminus of the route is at a cloverleaf interchange with I-95 near downtown Bangor, where I-395 continues west as U.S. Route 2 (US 2) and State Route 100 (SR 100). The eastern terminus is at US 1A in Brewer.

Interstate 695 (I-695) is a 51.46-mile-long (82.82 km) full beltway Interstate Highway extending around Baltimore, Maryland, United States. I-695 is officially designated the McKeldin Beltway, but is colloquially referred to as either the Baltimore Beltway or 695. The route is an auxiliary route of I-95, intersecting that route southwest of Baltimore near Arbutus and northeast of the city near White Marsh. It also intersects other major roads radiating from the Baltimore area, including I-97 near Glen Burnie, the Baltimore–Washington Parkway near Linthicum, I-70 near Woodlawn, I-795 near Pikesville, and I-83 in the Timonium area. The 19.37-mile (31.17 km) portion of the Baltimore Beltway between I-95 northeast of Baltimore and I-97 south of Baltimore is officially MD 695, and is not part of the Interstate Highway System, but is signed as I-695. This section of the route includes the Francis Scott Key Bridge that crosses over the Patapsco River. The bridge and its approaches are maintained by the Maryland Transportation Authority (MDTA) while the remainder of the Baltimore Beltway is maintained by the Maryland State Highway Administration (MDSHA).

Terminology and guidelines

Routes that begin with an even number generally connect to the main highway in two locations, while odd numbers only connect in one location. FHWA Auxiliary Route Numbering Diagram.svg
Routes that begin with an even number generally connect to the main highway in two locations, while odd numbers only connect in one location.

The basic tenets of the auxiliary Interstates are divided into three branches: spur, loop, and bypass routes. Each one signifies a different characteristic of the auxiliary route.

The first digit of the three digits usually determines whether a route is a bypass, spur, or beltway. The last two digits are derived from the main Interstate Highway. For instance, I-515 contains an odd number in the first digit (5), and this indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-515 shows that it is a supplement to I-15.

Interstate 515 (I-515) is a 14.444-mile-long (23.245 km) spur route of Interstate 15 in Nevada that runs from the junction of I-11, I-215 and SR 564 in Henderson to the junction of I-15, US 93 and US 95 in Downtown Las Vegas. The freeway connects traffic headed from Boulder City and Henderson to Downtown Las Vegas via a direct, high-speed route, and is concurrent with both US 93 and US 95 along its entire length.

Interstate 15 Interstate from California to Montana

Interstate 15 (I-15) is a major Interstate Highway in the western United States. I-15 begins near the Mexico–US border in San Diego County and stretches north to Alberta, Canada, passing through the states of California, Nevada, Arizona, Utah, Idaho, and Montana. The interstate serves the cities of San Diego, Las Vegas, St. George, Provo, Salt Lake City, Ogden, Pocatello, Idaho Falls, Butte, Helena, and Great Falls. It also passes close to the urban areas of Orange County, California and Los Angeles County, California. The stretches of I-15 in Idaho, Utah, and Arizona have been designated as the "Veterans Memorial Highway". The southern end is at a junction with I-8 and State Route 15 in San Diego, and the northern end is at a connection with Alberta Highway 4 at the Sweetgrass–Coutts Border Crossing.

Numerous exceptions to the standard numbering guidelines exist in many places. This can be for a number of reasons. In some cases, original routes were changed, extended, or abandoned, leaving discrepancies in the system. In other cases, it may not be possible to use the proper number because the limited set of available numbers has been exhausted, causing a "non-standard" number to be used.

Spur route

A spur route's number usually has an odd number for its first digit. [2] It is usually one of the following:

Examples include:

Sometimes, a three-digit Interstate Highway branches off from another three-digit Interstate Highway. These spurs do not connect directly with their parent highways, but are associated with them via the three-digit highways they do intersect with.

Examples include:

Bypass

A bypass route may traverse around a city, or may run through it with the mainline bypassing. In a typical 3-digit Interstate Highway, bypasses usually have both its two termini junctioned with another Interstate highway. Bypass routes are preceded by an even number in the first digit. [2]

Examples include:

In the case of an auxiliary Interstate highway which has both ends at Interstates but not the same Interstate, some states treat these as bypasses while others treat these as spurs — see Spur route above.

Beltway

A beltway (also known as a loop route) completely surrounds a metropolitan city, and it is often connected with multiple junctions to other routes. Unlike other auxiliary Interstate Highways, beltways do not have termini; however, they have a place where the highway mileage resets to zero. Beltways are also preceded by an even number in the first digit. [2]

Some examples of beltways include:

Auxiliary Interstates

Note: the table sorts the route numbers by parent highway.
NumberLength (mi) [3] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-H201.svg H-201 4.106.60 H-1 in Halawa, HI H-1 in Honolulu, HI 02004-01-012004 [4] current
I-105 (1961).svg I-105 17.3227.87 SR 1 in El Segundo, CA I-605 in Norwalk, CA 01963-01-011963currentReplaced segments of SR 42
I-205 (1961).svg I-205 12.9720.87 I-580 near Tracy, CA I-5 near Tracy, CA01970-01-011970current
I-305 (1961).svg I-305 6.009.66 I-80 in West Sacramento, CA I-80 Bus/US 50/SR 99 in Sacramento, CA 01981-01-011981currentUnsigned
I-405 (1961).svg I-405 72.15116.11 I-5 in Irvine, CA I-5 in Mission Hills, CA 01964-01-011964current
I-505 (1961).svg I-505 32.9853.08 I-80 in Vacaville, CA I-5 in Dunnigan, CA 01977-01-011977currentOriginally part of I-5W
I-605 (1961).svg I-605 27.4044.10 I-405 in Seal Beach, CA I-210 in Irwindale, CA 01964-01-011964current
I-805 (1961).svg I-805 28.0245.09 I-5 in San Ysidro, CA I-5 in Sorrento Valley, CA 01959-01-011959current
I-905 (1961).svg I-905 8.96 [5] 14.42 I-5 in San Ysidro, CA Fed. 2 at the United States-Mexico border in Otay Mesa, CA proposedCurrently SR 905, proposed to be signed as an Interstate
I-105.svg I-105 3.495.62 OR 99 in Eugene, OR I-5 in Springfield, OR 02011-01-012011current
I-405.svg I-405 3.535.68 I-5 in Portland, OR I-5 in Portland, OR01969-01-011969current
I-205.svg I-205 36.6458.97 I-5 in Tualatin, OR I-5 in Salmon Creek, WA 01975-01-011975current
I-405.svg I-405 30.3048.76 I-5/SR 518 in Tukwila, WA I-5/SR 525 in Lynnwood, WA 01964-01-011964current
I-605.svg I-605 proposedProposed to bypass Seattle, WA
I-705.svg I-705 1.502.41 I-5/SR 7 in Tacoma, WA 01990-01-011990currentSchuster Parkway in Tacoma
I-210.svg I-210 I-10 in Mobile, AL (original southern terminus) I-65 in Prichard, AL Currently I-165, the route number was decommissioned because it had no connection to I-10
I-410.svg I-410 I-10/I-17 in Phoenix, AZ I-10 in Phoenix, AZNow part of I-10 in Phoenix, AZ
I-510.svg I-510 I-10/SR 51 in Phoenix, AZ SR 101 in Phoenix, AZCurrently designated as SR 51 (Piestewa Freeway)
I-710.svg I-710 I-10 in Tucson, AZ North Campbell Avenue/East 6th Street in Tucson, AZMostly never built freeway that was to connect to University of Arizona campus from I-10
I-110 (1961).svg I-110 20.4332.88 SR 47 in San Pedro, CA I-10/SR 110 in Los Angeles, CA 01978-01-011978currentOriginally part of US 66, then signed as SR 11
I-210 (1961).svg I-210 48.7278.41 I-5 in Sylmar, CA SR 57/SR 210 in Glendora, CA 01964-01-011964currentSegment from SR 57 east to I-10 is still signed as SR 210, formerly SR 30 prior to 2007.
I-710 (1961).svg I-710 19.6631.64 Terminal Island in Long Beach, CA Valley Boulevard in Alhambra, CA 01983-01-011983currentOriginally signed as SR 7
I-110.svg I-110 6.9411.17 US 98 Bus. near Pensacola, FL I-10 near Pensacola, FL01969-01-011969current
I-110.svg I-110 8.8914.31 I-10 in Baton Rouge, LA US 61 in Baton Rouge, LA01964-01-011964current
I-210.svg I-210 12.4019.96 I-10 west of Lake Charles, LA I-10 east of Lake Charles, LA01964-01-011964current
I-310.svg I-310 11.2518.11 US 90/LA 3127 in Boutte, LA I-10 west of Kenner, LA 01983-01-011983current
I-310.svg I-310 2.704.35 US 90 Bus. in New Orleans, LA I-10 in New Orleans, LA01964-01-01196401969-01-011969Cancelled Vieux Carré Riverfront Expressway
I-410.svg I-410 1.903.06 LA 67 in Baton Rouge, LA I-10 in Baton Rouge, LA01961-01-01196101964-01-011964Renumbered as I-110
I-410.svg I-410 I-10 west of New Orleans, LA I-10 in New Orleans, LA01969-01-01196901977-01-011977Cancelled southern bypass of New Orleans
I-510.svg I-510 3.044.89 LA 47 in New Orleans, LA I-10/LA 47 in New Orleans, LA01992-01-011992current
I-610.svg I-610 4.527.27 I-10 at MetairieNew Orleans, LA, lineI-10 in New Orleans, LA01965-01-011965current
I-910.svg I-910 9.7015.61 US 90 Bus. in Marrero, LA I-10/US 90 Bus. in New Orleans, LA 01999-01-011999currentSigned as part of US 90 Bus. and Future I-49
I-110.svg I-110 4.106.60 US 90 in Biloxi, MS I-10 in D'Iberville, MS 01988-01-011988current
I-310.svg I-310 US 90 near the Port of Gulfport, MS I-10 in Gulfport, MSproposedFuture spur into Gulfport, MS
I-110.svg I-110 0.921.48Av Abraham Lincoln at the United States-Mexico border in El Paso, TX I-10 in El Paso, TX01967-01-011967currentShortest signed Interstate in the country
I-410.svg I-410 49.4979.65Beltway around San Antonio, TX 01959-01-011959current
I-610.svg I-610 37.9761.11Beltway around Houston, TX 01975-01-011975current
I-215 (1961).svg I-215 54.5087.71 I-15 in Murrieta, CA I-15 in Devore, CA 01982-01-011982currentOriginally signed as I-15E, then SR 215
I-115.svg I-115 1.191.92 I-15/I-90 in Butte, MT Iron Street in Butte, MT01971-01-011971current
I-315.svg I-315 0.831.34 I-15 in Great Falls, MT I-15 Bus/US 89 in Great Falls, MT01960-06-141960currentUnsigned
I-215.svg I215 11.1017.86 I-15/Clark County Route 215 near Paradise, NV I-515/US 93/SR 564 in Henderson, NV 01996-01-011996current
I-515.svg I515 20.5433.06 US 93/US 95 in Henderson, NV I-15/US 93/US 95 in Las Vegas, NV 01976-01-011976currentNot signed until 1994, this route is entirely concurrent with US 93/US 95
I-215.svg I-215 29.0246.70 I-80 in Salt Lake City, UT I-15 in North Salt Lake, UT 01963-01-011963current
I-415.svg I-415 2.393.85 I-80 in Salt Lake City, UT 4430 S in Holladay, Utah01965-01-01196501969-01-011969Designation was scrapped to provide a single route number 215 for the entire route.
I-516.svg I-516 6.4910.44 SR 21/SR 204 in Savannah, GA SR 21 in Garden City, GA 01985-01-011985current
I-420.svg I-420 5.408.69 I-285 in College Park, GA I-20 in Atlanta, GA 01983-01-01198301986-01-011986Never built, was planned to bypass Atlanta, GA
I-520.svg I-520 16.1425.97 I-20 in Augusta, GA I-20 in North Augusta, SC 01980-01-011980current
I-220.svg I-220 17.6228.36 I-20/LA 3132 in Shreveport, LA I-20 in Bossier City, LA 01979-01-011979current
I-420.svg I-420 10.2016.42 I-20 in West Monroe, LA I-20 in Monroe, LA 01957-01-01195701964-01-011964Cancelled bypass of Monroe
I-220.svg I-220 12.0119.33 I-20 in Jackson, MS I-55 in Ridgeland, MS 01981-01-011981current
I-820.svg I-820 35.1756.60 I-20 in Fort Worth, TX I-20/US 287 in Fort Worth, TX01959-01-011959current
I-222.svg I-222 I-22 near Birmingham, AL I-422 near Birmingham, ALproposed
I-422.svg I-422 I-20/I-59/I-459/US 11 in Bessemer, AL I-59 in Argo, AL proposedIf built, it will have no direct connections to I-22.
I-124.svg I-124 1.973.17 I-24 in Chattanooga, TN US 27 in Chattanooga, TN01960-01-011960currentUnsigned
I-225.svg I-225 12.0019.31 I-25 in Denver, CO I-70 in Aurora, CO 01976-01-011976current
I-126.svg I-126 3.685.92 I-26 in Columbia, SC US 21/US 76/US 176/US 321 in Columbia, SC01961-01-011961current
I-326.svg I-326 5.248.43 I-26 in Cayce, SC SC 48 in Columbia, SC 01976-01-01197601995-01-011995Now part of I-77, formerly unsigned
I-526.svg I-526 19.2631.00 US 17 in Charleston, SC I-526 Bus./US 17 in Mount Pleasant, SC 01989-01-011989current
I-129.svg I-129 3.485.60 US 20/US 75/US 77 in South Sioux City, NE I-29/US 20/US 75 in Sioux City, IA 01976-01-011976current
I-229.svg I-229 14.9724.09 I-29 in St. Joseph, MO I-29/US 59/US 71 in St. Joseph, MO01986-01-011986current
I-229.svg I-229 11.3318.23 I-29 in Sioux Falls, SD I-90 near Sioux Falls, SD01966-01-011966current
I-130.svg I-130 58 I-30/I-49 in Texarkana, AR US 59/US 71 near Texarkana, AR02000-01-01200002014-01-012014Now part of I-49
I-430.svg I-430 12.9320.81 I-30/US 67 in Little Rock, AR I-40/US 65 in Little Rock, AR01980-01-011980current
I-530.svg I-530 46.6575.08 US 65 in Pine Bluff, AR I-30/I-440 in Little Rock, AR 01999-01-011999current
I-630.svg I-630 7.4011.91 I-430 near Little Rock, AR I-30 in Little Rock, AR01985-01-011985current
I-235.svg I-235 13.7822.18 I-35/I-80 in West Des Moines, IA I-35/I-80 near Des Moines, IA 01961-01-011961current
I-135.svg I-135 95.74154.08 Kansas Turnpike/I-35 in Wichita, KS I-70/US 81 in Salina, KS 01976-01-011976current
I-235.svg I-235 16.5226.59 I-135/US 81 in Wichita, KS I-135/US 81/K-15/K-254 in Wichita, KS01965-01-011965current
I-335.svg I-335 50.1380.68 I-35/Kansas Turnpike/US 50 in Emporia, KS I-470/Kansas Turnpike in Topeka, KS 01987-01-011987current
I-435.svg I-435 80.81130.05Beltway around Kansas City, KS, and Kansas City, MO 01965-01-011965current
I-635.svg I-635 8.9014.32 I-35 in Overland Park, KS I-29/US 71 in Kansas City, MO 01968-01-011968current
I-335.svg I-335 2.74 [6] 4.41 I-94 in Minneapolis, MN I-35W in Minneapolis, MN01964-01-01196401978-01-011978Cancelled
I-535.svg I-535 2.784.47 I-35/US 53 in Duluth, MN US 53/WIS 35 in Superior, WI 01971-01-011971current
I-235 (long).svg I-235 5.368.63 I-35/I-40 in Oklahoma City, OK I-44 in Oklahoma City, OK01989-01-011989current
I-635.svg I-635 37.0059.55 SH 121 in Grapevine, TX I-20 in Balch Springs, TX 01959-01-011959current
I-238 (1961).svg I-238 2.233.59 I-880 in San Leandro, CA I-580/SR 238 in Castro Valley, CA 01983-01-011983currentConsidered an auxiliary route of I-80 in California; there is no I-38
I-440.svg I-440 9.9616.03 I-30/I-530 near Little Rock, AR I-40/AR 440 near Little Rock, AR02003-01-012003current
I-540.svg I-540 15.8725.54 US 271/AR 253 near Fort Smith, AR I-40 in Van Buren, AR 01965-01-011965current
I-140.svg I-140 6.7910.93 US 17 near Winnabow, NC I-40/US 17 in Wilmington, NC 02008-01-012008current
I-240.svg I-240 9.5415.35 I-26/I-40/US 74 near Asheville, NC I-40/US 74A in Asheville, NC01980-01-011980current
I-440.svg I-440 16.7726.99 I-40/US 1/US 64 near Cary, NC I-40 near Raleigh, NC 01991-01-011991current
I-540.svg I-540 25.8441.59 I-40 near Durham, NC I-87/US 64/US 264 near Knightdale, NC 01997-01-011997current
I-840.svg I-840 5.779.29 I-40/I-73/US 421 in Greensboro, NC I-40/I-85/I-785/I-85 Bus. in Greensboro, NC02011-01-012011current
I-240 (long).svg I-240 16.2226.10I-44/US 62 in Oklahoma City, OK I-40/US 270 in Oklahoma City, OK01965-01-011965current
I-440 (long).svg I-440 9.9616.03 I-40/I-240 near Oklahoma, OK I-35 in Oklahoma City, OK01975-01-011975Now part of I-44
I-140.svg I-140 11.1717.98 I-40 near Farragut, TN US 129 near Alcoa, TN 01987-01-011987current
I-240.svg I-240 19.2731.01 I-40 in Memphis, TN I-40 in Memphis, TN01970-01-011970current
I-440.svg I-440 7.6412.30 I-40 in Nashville, TN I-24 in Nashville, TN01987-01-011987current
I-640.svg I-640 7.0311.31 I-40 in Knoxville, TN I-40 in Knoxville, TN01982-01-011982current
I-840.svg I-840 77.28 [7] 124.37 I-40 near Dickson, TN I-40 near Lebanon, TN 02016-01-012016current
I-244 (long).svg I-244 15.7525.35 I-44 in Tulsa, OK I-44 in Tulsa, OK01970-01-011970current
I-444 (long).svg I-444 2.514.04 I-244 in Tulsa, OK I-244 in Tulsa, OK01970-01-011970currentUnsigned
I-345.svg I-345 1.402.25 I-30/I-45 in Dallas, TX US 75 in Dallas, TX01973-01-011973currentUnsigned
I-555.svg I-555 49.8080.15 I-55 in Turrell, AR AR 91 in Jonesboro, AR 02016-01-012016current
I-155.svg I-155 32.1351.71 I-74 in Morton, IL I-55 in Lincoln, IL 01992-01-011992current
I-255.svg I-255 30.8249.60 I-55/I-270 in Mehlville, MO I-270/IL 255 in Pontoon Beach, IL 01986-01-011986current
I-355.svg I-355 32.5152.32 I-80 in New Lenox, IL I-290 in Itasca, IL 01989-01-011989current
I-155.svg I-155 15.9325.64 I-55 near Hayti, MO US 51 at Dyersburg, TN 01980-01-011980current
I-255.svg I-255 I-55/I-240 in Memphis, TN I-40 in Memphis, TNNow part of I-55 and I-240
I-359.svg I-359 2.303.70 I-20/I-59 in southern Tuscaloosa, AL 15th Street in downtown Tuscaloosa, AL01983-01-011983current
I-459.svg I-459 32.8052.79 I-20/I-59 in Bessemer, AL I-59 in Trussville, AL 01984-01-011984current
I-759.svg I-759 4.507.24 I-59 in Attalla, AL US 411/SR 759 in Gadsden, AL 01986-01-011986current
I-164.svg I-164 21.39 [8] 34.42 US 41/Veterans Memorial Parkway in Evansville, IN I-69 in Evansville, IN01990-01-01199002014-01-012014Decommissioned; now part of I-69 [9]
I-264.svg I-264 22.9336.90 I-64 in Louisville, KY I-71 in Louisville, KY01956-01-011956current
I-264.svg I-264 25.0740.35 I-64/I-664 in Chesapeake, VA Parks Ave in Virginia Beach, VA 01960-01-011960current
I-464.svg I-464 4.717.58 I-64 in Chesapeake, VA I-264 in Norfolk, VA 01960-01-011960current
I-564.svg I-564 3.034.88 SR 337 I-64 in Norfolk, VA 01970-01-011970current
I-664.svg I-664 20.2132.52 I-64/I-264 in Norfolk, VA I-64 in Hampton, VA 01971-01-011971current
I-165.svg I-165 4.907.89 US 43 in Mobile, AL I-65 in Mobile, AL01994-01-011994current
I-565.svg I-565 21.4034.44 I-65/US 72/SR 20 in Decatur, AL US 72 in Huntsville, AL 01991-01-011991current
I-165.svg I-165 2.704.35 I-65/I-70 in Indianapolis, IN 38th Street in Indianapolis, IN01978-01-01197801981-01-011981Was to be a spur linking from I-65/70 to 38th Street entirely with Indianapolis
I-265.svg I-265 6.7310.83 I-64 in New Albany, IN SR 62/SR 265 in Clarksville, IN 01977-01-011977currentConnected with I-265 in Kentucky on December 18, 2016, with the completion of the East End Bridge
I-465.svg I-465 52.7984.96Beltway around Indianapolis 01970-01-011970current
I-865.svg I-865 4.727.60 I-65 near Indianapolis, IN I-465 near Indianapolis02002-01-012002current
I-265.svg I-265 24.4839.40 I-65/KY 841 in Heritage Creek, KY I-71/KY 841 in Prospect, KY 01977-01-011977currentConnected with I-265 in Indiana on December 18, 2016, with the completion of the East End Bridge
I-265.svg I-265 23 I-40 in Nashville, TN I-65 in Nashville, TN02000-01-012000Now part of I-65
I-165.svg I-165 69.684112.146 I-65 in Bowling Green, KY US 60/US 231 in Owensboro, KY 02019-01-012019currentReplaced the William H. Natcher Parkway
I-266.svg I266 1.792.8801972-01-011972Proposed loop route of I-66 between the District, and Arlington County; if built, would have been the only auxiliary route of I-66; cancelled in the face of community opposition during Washington's freeway revolts
I-169.svg I-169 34.2755.15 I-24 near Hopkinsville, KY I-69 in Nortonville, KY 02017-05-072017currentNew designation along the former Pennyrile Parkway
I-369.svg I-369 23.44137.725 I-69/Pennyrile Parkway in Henderson, KY US 60 in Owensboro, KY proposedProposed for designation along Audubon Parkway once upgraded to Interstate standards
I-269.svg I-269 45.1972.73 I-55/I-69 in Hernando, MS I-69 in Millington, TN 02015-01-012015currentConstruction completed in October 2018; co-signed with SR 304 in MS and SR 385 in TN
I-169.svg I-169 18.730.1 US 45W/US 51 in Union City, TN US 45E/SR 43 in Martin, TN proposedProposed for designation along SR 22 once upgraded to Interstate standards
I-469.svg I-469 30.8349.62 I-69 in Fort Wayne, IN I-69 in Fort Wayne, IN01995-01-011995current
I-169.svg I-169 1.502.41 I-69E/US 77/US 83 in Olmito, TX Port of Brownsville main entrance in Brownsville, TX 02015-01-012015currentCurrently under construction; partially open and co-signed with SH 550
I-369.svg I-369 3.505.63 Tenaha, TX Texarkana, TX 02013-01-012013currentPartially completed in 2013. Eventually, it will surpass I-476 as the longest Auxiliary Interstate in the country.
I-270.svg I-270 5.318.55 I-25/US 36 at Welby, CO I-70/US 36 at Denver, CO 01965-01-011965current
I-470.svg I-470 Beltway around Denver Metro, CONow part of SH 470
I-270.svg I-270 50.5981.42 I-55/Interstate 255 I-55/I-70 near Troy, IL 01956-01-011956current
I-470.svg I-470 13.7222.08 I-70 in Topeka, KS I-70/Kansas Turnpike in Topeka, KS01960-01-011960current
I-670.svg I-670 2.814.52 I-70 in Kansas City, KS I-70 in Kansas City, MO 01968-01-011968current
I-170.svg I-170 2.303.70 I-70 in Baltimore, MD US 40 in Baltimore, MD01969-01-01196901983-01-011983Cancelled
I-270.svg I-270 32.6052.46 I-70 near Frederick, MD I-495 north of Bethesda, MD 01975-01-011975current
No image.svgSpur plate blue.svgNo image.svg
I-270.svg I-270 Spur
2.10 [10] 3.38 I-270 east of Potomac, MD Interstate 495I-495 northwest of Bethesda, MD 01975-01-011975currentServes as an alternate connector for Virginia travelers
I-370.svg I-370 2.544.09 I-270 in Gaithersburg, MD MD 200 in Derwood, MD 01988-01-011988current
I-170.svg I-170 11.1717.98 I-64/US 40 in Richmond Heights, MO I-270 in Hazelwood, MO 01956-01-011956current
I-470.svg I-470 16.7226.91 I-49/I-435 in Kansas City, MO I-70 in Independence, MO 01983-01-011983current
I-270.svg I-270 54.9788.47Beltway around Columbus, OH 01964-01-011964current
I-470.svg I-470 6.6910.77 I-70 near Blaine, OH I-70 in Elm Grove, WV 01976-01-011976current
I-670.svg I-670 9.3715.08 I-70 in Columbus, OH I-270 near John Glenn Columbus International Airport 02003-01-012003current
I-271.svg I-271 46.0674.13 I-71 near Medina, OH I-90 in Willoughby Hills, OH 01964-01-011964current
I-471.svg I-471 5.759.25 I-275 near Newport, KY I-71 in Cincinnati, OH 01981-01-011981current
I-172.svg I-172 19.6931.69 I-72 in Quincy, IL US 24 in Quincy, IL01995-01-011995current
I-474.svg I-474 14.8823.95 I-74 in Peoria, IL I-74 in Morton, IL 01973-01-011973current
I-274.svg I-274 proposedProposed route in Winston-Salem, NC
I-175.svg I-175 1.442.32 I-275 in St. Petersburg, FL SR 687 in St. Petersburg, FL01980-01-011980current
I-275.svg I-275 60.6497.59 I-75 near Memphis, FL I-75 in Wesley Chapel, FL 01973-01-011973current
I-375.svg I-375 1.342.16 I-275 in St. Petersburg, FL US 92 in St. Petersburg, FL01979-01-011979current
I-175.svg I-175 US 82 in Albany, GA I-75 in Cordele, GA Now part of SR 300
I-475.svg I-475 15.8325.48 I-75 in Macon, GA I-75 in Macon, GA01965-01-011965current
I-575.svg I-575 30.9749.84 I-75 in Kennesaw, GA SR 5 west of Nelson, GA 01985-01-011985current
I-675.svg I-675 11.0417.77 I-75 in Stockbridge, GA I-285 southeast of Atlanta, GA 01987-01-011987current
I-275.svg I-275 83.71134.72Beltway around Cincinnati, OH 01962-01-011962currentRuns through Indiana, Ohio and Kentucky; I-75 does not run through Indiana
I-275.svg I-275 35.01 [11] [lower-alpha 1] 56.34 I-75 near Monroe, MI I-96, I-696 and M-5 in Farmington Hills, MI 01977-01-011977current
I-375.svg I-375 1.061.71 BS I-375 in Detroit, MI I-75 in Detroit, MI01964-01-011964current
I-475.svg I-475 16.9927.34 I-75 near Grand Blanc, MI I-75/US 23 near Mount Morris, MI 01973-01-011973currentRuns east and north of Flint, MI
I-675.svg I-675 7.7212.42 I-75/US 23 near Saginaw, MI I-75/US 23 near Zilwaukee, MI 01971-01-011971current
I-475.svg I-475 20.3732.78 I-75 in Perrysburg, OH I-75 in Toledo, OH 01964-01-011964current
I-675.svg I-675 26.5342.70 I-75 near Miamisburg, OH I-70 near Medway, OH 01987-01-011987current
I-175.svg I-175 I-75 in Chattanooga, TN I-75 in Lexington, KY
I-275.svg I-275 2.984.80 I-40 in Knoxville, TN I-75/I-640 in Knoxville, TN01982-01-011982current
I-475.svg I-475 I-40/I-75 near Knoxville, TN I-75 near Knoxville, TNCancelled
I-676.svg I-676 6.9011.10 I-76/US 30 in Philadelphia, PA I-76 in Camden, NJ 01991-01-011991current
I-176.svg I-176 11.3318.23 I-76/Pennsylvania Turnpike in Morgantown, PA US 422 near Reading, PA 01964-01-011964current
I-276.svg I-276 29.7847.93 I-76 in King of Prussia, PA I-95/I-295 in Bristol Township, PA 01964-01-011964currentTruncated in 2018, replaced by I-95
I-376.svg I-376 78.70126.66 I-80 near Hermitage, PA I-76/US 22 in Monroeville, PA 01972-01-011972current
I-476.svg I-476 129.61208.59 I-95 near Chester, PA I-81/US 6/US 11 near Clarks Summit, PA 01992-01-011992current
I-576.svg I-576 proposedProposed Southern Beltway route from Pittsburgh International Airport to I-376
I-876.svg I-876 01971-01-01197101972-01-011972Short lived renumbering of I-479, now I-579
I-277.svg I-277 4.467.18Beltway around uptown Charlotte, NC 01981-01-011981current
I-277.svg I-277 4.146.66 I-76 in Akron, OH I-77 in Akron, OH01970-01-011970current
I-178.svg I-178 01971-01-011971Cancelled
I-378.svg I-378 01968-01-01196801971-01-011971Replaced by PA Route 378
I-278.svg I-278 35.6257.32 US 1/9 in Linden, NJ Bruckner Interchange in Bronx, NY 01961-01-011961currentDoes not intersect with parent route I-78
I-478.svg I-478 2.143.44 I-278 in Brooklyn, NY NY 9A in Manhattan, NY 01971-01-011971currentUnsigned; does not intersect with parent route I-78
I-678.svg I-678 14.3323.06 John F. Kennedy International Airport in Queens, NY Bruckner Interchange in Bronx, NY 01965-01-011965currentDoes not intersect with parent route I-78
I-878.svg I-878 0.701.13I-678 in Queens, NY, near John F. Kennedy International Airport JFK Expressway in Queens, NY, near JFK Airport01970-01-011970currentUnsigned; does not intersect with parent route I-78
I-179.svg I-179 McKean Township, PA Erie, PA 01958-01-01195801968-01-011968Replaced by its parent route, I-79
I-279.svg I-279 13.3221.44 I-376/US 22/US 30 in Pittsburgh, PA I-79 in Franklin Park, PA 01972-01-011972current
I-479.svg I-479 01966-01-01196601971-01-011971Early number for I-579
I-579.svg I-579 1.572.53 PA 885 in Pittsburgh, PA I-279/PA 28 in Pittsburgh01962-01-011962current
I-180 (1961).svg I-180 US 101 in San Rafael, CA I-80 near Berkeley, CA 01978-01-01197801991-01-011991Temporary designation of what was formerly part of SR 17, now part of I-580
I-280 (1961).svg I-280 57.2292.09 I-680/US 101 in San Jose, CA King Street in San Francisco, CA 01964-01-011964current
I-380 (1961).svg I-380 1.6712.689 I-280 in San Bruno, CA US 101 in San Bruno, CA01964-01-011964current
I-480 (1961).svg I-480 I-80 in San Francisco, CA Sansome Street in San Francisco, CA01957-01-01195701968-01-011968Was to be the Embarcadero Freeway; downgraded to a state highway in 1968 and fully decommissioned in 1991
I-580 (1961).svg I-580 75.63121.71 US 101 in San Rafael, CA I-5 near Westley, CA 01964-01-011964currentSegments were originally part of I-5W
I-680 (1961).svg I-680 70.52113.49 I-280/US 101 in San Jose, CA I-80 in Cordelia, CA 01955-01-011955currentOriginally SR 21
I-780 (1961).svg I-780 6.5010.46 I-80 in Vallejo, CA I-680 in Benicia, CA 01955-01-011955currentOriginally part of I-680
I-880 (1961).svg I-880 47.2275.99 I-280/SR 17 in San Jose, CA I-80/I-580 in Oakland, CA 01983-01-011983currentOriginally part of SR 17
I-880 (1961).svg I-880 I-80 in West Sacramento, CA I-80 in Sacramento, CA 01971-01-01197101983-01-011983Now part of I-80
I-980 (1961).svg I-980 2.033.27 I-880 in Oakland, CA I-580/SR 24 in Oakland, CA01981-01-011981current
I-580.svg I580 30.0948.43 US 50 in Carson City, NV I-80 in Reno, NV 02012-01-012012currentRuns concurrently with US 395
I-180.svg I-180 13.1921.23 IL 26/IL 71 in Hennepin, IL I-80 near Princeton, IL 01969-01-011969current
I-280.svg I-280 26.9843.42 I-80 near Davenport, IA I-74/I-80 near Colona, IL 01990-01-011990current
I-380.svg I-380 73.05117.56 I-80 near Iowa City, IA US 218 in Waterloo, IA 01985-01-011985currentConnects Cedar Rapids, IA, with I-80
I-480.svg I-480 4.907.89 I-80/US 75 in Omaha, NE I-29/US 6 in Council Bluffs, IA 01966-01-011966current
I-680.svg I-680 42.8668.98 I-80 in Omaha, NE I-80 near Neola, IA 01966-01-011966current
I-180.svg I-180 3.185.12 US 34 in Lincoln, NE I-80/US 34/US 77 in Lincoln, NE01965-01-011965current
I-280.svg I-280 01958-01-01195801965-01-011965Now designated as I-680
I-580.svg I-580 1.602.57 I-480 in Omaha, NE Lake Street in Omaha, NE01976-01-01197601982-01-011982Now part of US 75
I-280.svg I-280 17.8528.73 I-80 in Parsippany-Troy Hills, NJ I-95/New Jersey Turnpike in Kearny, NJ 01958-01-011958current
I-280.svg I-280 12.4119.97 I-75 in Toledo, OH I-80/I-90/Ohio Turnpike in Lake Township, OH 01959-01-011959current
I-380.svg I-380 I-76/I-77 in Akron, OH I-271 in Macedonia, OH proposed
I-480.svg I-480 41.7767.22 I-80/Ohio Turnpike in North Ridgeville, OH I-80/Ohio Turnpike in Streetsboro, OH 01971-01-011971current
I-680.svg I-680 16.4326.44 I-76/Ohio Turnpike in North Lima, OH I-80/SR 11 near Mineral Ridge, OH 01964-01-011964current
I-180.svg I-180 28.8546.43 US 15/US 220 in Williamsport, PA I-80/PA 147 near Milton, PA 01984-01-011984current
I-180.svg I-180 Now part of I-176
I-280.svg I-280 01958-01-01195801964-01-011964Now part of Pennsylvania Turnpike
I-380.svg I-380 24.7639.85 I-80 in Tunkhannock Township, PA I-81/I-84/US 6 in Dunmore, PA 01973-01-011973current
I-480.svg I-480 Now part of I-476
I-680.svg I-680 01958-01-01195801964-01-011964Now I-676
I-180.svg I-180 1.091.75 I-80 in Cheyenne, WY I-80 Bus./US 30 in Cheyenne, WY01984-01-011984currentNot built to Interstate Highway standards
I-481.svg I-481 15.0424.20 I-81 in Onondaga, NY I-81/NY 481 in North Syracuse, NY 01970-01-011970current
I-781.svg I-781 4.306.92 I-81 in Pamelia, NY Fort Drum main gate in Le Ray, NY 02012-01-012012current
I-381.svg I-381 1.672.69 SR 381 in Bristol, VA I-81 in Bristol, VA01961-01-011961current
I-581.svg I-581 6.6410.69 US 220/SR 24 in Roanoke, VA I-81 near Hollins, VA
I-181.svg I-181 23.8538.38 US 321/SR 67 in Johnson City, TN US 11W/SR 1 in Kingsport, TN 01985-01-01198502007-01-012007Now part of I-26
I-182.svg I-182 15.1924.45 I-82/US 12 near Richland, WA US 12/US 395 in Pasco, WA 01986-01-011986current
I-283.svg I-283 2.914.68 I-76/Pennsylvania Turnpike near Highspire, PA I-83/US 322/Capital Beltway near Harrisburg, PA 01972-01-011972current
I-384.svg I-384 8.2013.20 I-84/US 6 in East Hartford, CT US 6/US 44 in Bolton, CT 01984-01-011984current
I-684.svg I-684 28.4745.82 I-287 near White Plains, NY NY 22 near Brewster, NY 01974-01-011974currentAlso crosses into Connecticut
I-184.svg I-184 3.625.83 I-84 in Boise, ID US 20/US 26 01990-01-011990current
I-685.svg I-685 14.0022.53 I-65 in downtown Montgomery, AL I-85 in Montgomery, ALproposed
I-185.svg I-185 49.3079.34 US 27/US 280/SR 520 in Columbus, GA I-85 near LaGrange, GA 01979-01-011979current
I-285.svg I-285 63.98102.97Beltway around Atlanta, GA 01969-01-011969current
I-485.svg I-485 5.99.5 I-75/I-85 in Atlanta, GA I-85 in Atlanta01964-01-01196401975-01-011975Now Freedom Parkway, was planned to relieve traffic along Downtown Connector (I-75/85) through downtown Atlanta
I-985.svg I-985 24.0438.69 I-85 near Buford, GA SR 369 near Gainesville, GA 01985-01-011985current
I-285.svg I-285 22.836.7 I-85/I-85 Bus./US 29/US 52/US 70 near Lexington, NC I-40/US 52/US 311/NC 8 in Winston-Salem, NC 02018-01-012018currentAn unconfirmed section of Future I-285 is to continue north of I-40 for 10 miles (16 km) along US 52, through downtown Winston-Salem, to the proposed Winston-Salem Northern Beltway. [14] [15]
I-485.svg I-485 66.68107.31Beltway around Charlotte, NC 01988-01-011988current
I-785.svg I-785 2.213.56 I-40/I-85/I-840/I-85 Bus. in Greensboro, NC US 70 in Greensboro, NC02013-01-012013currentFuture northern terminus at US 29/US 58/US 360/US 58 Bus. in Danville, VA
I-885.svg I-885 proposed
I-185.svg I-185 17.7028.49 I-385 near Mauldin, SC US 29 in Greenville, SC 01955-01-011955current
I-385.svg I-385 42.1667.85 I-26 near Clinton, SC US 276 in Greenville, SC 01962-01-011962current
I-585.svg I-585 2.253.62 US 176/US 221/SC 9 in Spartanburg, SC I-85 Bus./US 176 near Spartanburg, SC01962-01-011962current
I-287.svg I-287 98.72158.87 I-95/New Jersey Turnpike in Edison, NJ I-95 in Rye, NY 01961-01-011961current
I-587.svg I-587 1.211.95 I-87/New York State Thruway/NY 28 in Kingston, NY NY 28/NY 32 in Kingston, NY01960-01-011960current
I-587.svg I-587 Future I-87 (current US 64) near Zebulon, NC US 264 near Greenville, NC proposed [16]
I-787.svg I-787 10.1616.35 I-87/New York State Thruway in Albany, NY NY 7 in Green Island, NY 01968-01-011968current
I-189.svg I-189 1.492.40 US 7 in South Burlington, VT I-89 in South Burlington, VT01980-01-011980current
I-190.svg I-190 3.074.94 O'Hare International Airport in Chicago, IL I-90 in Chicago, IL01978-01-011978current
I-290.svg I-290 29.8448.02 I-90/IL 53 in Rolling Meadows, IL I-90/I-94/Congress Parkway in Chicago, IL 01972-01-011972current
I-490.svg I-490 I-294 I-90 proposedProposed route number for the O'Hare West Bypass [17]
I-190.svg I190 19.2631.00 I-290 in Worcester, MA Route 2 in Leominster, MA 01983-01-011983current
I-290.svg I290 20.1632.44 I-395 in Auburn, MA I-495 in Marlborough, MA 01970-01-011970current
I-190.svg I-190 28.3445.61 I-90/New York State Thruway in Cheektowaga, NY Highway 405 at Lewiston, NY 01959-01-011959current
I-290.svg I-290 9.8015.77 I-190 in Tonawanda, NY I-90/New York State Thruway in Williamsville, NY 01964-01-011964current
I-390.svg I-390 76.06122.41 I-86/NY 17 in Avoca, NY I-490 in Gates, NY 01973-01-011973current
I-490.svg I-490 37.4060.19 I-90/New York State Thruway in Bergen, NY I-90/New York State Thruway in Victor, NY 01970-01-011970current
I-590.svg I-590 5.318.55 I-390 in Brighton, NY I-490/NY 590 in Rochester, NY 01980-01-011980current
I-690.svg I-690 14.1922.84 I-90/New York State Thruway/NY 690 in Van Buren, NY I-481 in East Syracuse, NY 01962-01-011962current
I-790.svg I-790 2.413.88 I-90/New York State Thruway in Deerfield, NY NY 5A/NY 55 in Utica, NY 01961-01-011961current
I-890.svg I-890 9.3515.05 I-90/New York State Thruway in Rotterdam, NY I-90/New York State Thruway in Guilderland, NY 01962-01-011962current
I-990.svg I-990 6.3510.22 I-290 in Amherst, NY NY 263 near Lockport, NY 01985-01-011985currentHighest numbered Interstate in the Interstate system
I-490.svg I-490 2.433.91 I-71/I-90 in Cleveland, OH East 55th Street in Cleveland, OH01990-01-011990current
I-190.svg I-190 1.722.77 I-90 in Rapid City, SD US 16 in Rapid City, SD01962-01-011962current
I-291.svg I-291 6.029.69 I-91 in Windsor, CT I-84 in Manchester, CT 01994-01-011994current
I-691.svg I-691 8.3813.49 I-84 at the Southington-Cheshire, CT, town line I-91 in Meriden, CT 01988-01-011988current
I-291.svg I291 5.448.75 I-91 in Springfield, MA I-90/Massachusetts Turnpike in Chicopee, MA 01972-01-011972current
I-391.svg I391 4.467.18 I-91 in Chicopee, MA High Street in Holyoke, MA 01970-01-011970current
I-293.svg I293 11.1817.99 I-93/NH 101 in Manchester, NH I-93/Everett Turnpike in Hooksett, NH 02008-01-012008current
I-393.svg I393 4.607.40 I-93 in Concord, NH NH 9 in Pembroke, NH 01979-01-011979current
I-294.svg I-294 53.4285.97 I-80/I-94 in South Holland, IL I-94 in Deerfield, IL 01968-01-011968current
I-194.svg I-194 3.385.44 I-94 in Battle Creek, MI M-66 in Battle Creek, MI01961-01-011961current
I-394.svg I-394 9.7515.69 I-494/US 12 in Minnetonka, MN 4th Street in Minneapolis, MN 01991-01-011991current
I-494.svg I-494 42.9469.11 I-94/I-694 in Maple Grove, MN I-94/I-694 in Woodbury, MN 01985-01-011985currentWestern and southern half of the Minneapolis–St. Paul beltway
I-694.svg I-694 30.7749.52 I-94/I-494 in Maple Grove, MN I-94/I-494 in Woodbury, MN 01970-01-011970currentNorthern and eastern half of the Minneapolis–St. Paul beltway
I-194.svg I-194 1.201.93McKenzie Drive near Bismarck, ND I-94 near Mandan, ND Unsigned
I-794.svg I-794 3.756.04 I-43/I-94 in Milwaukee, WI WIS 794 in Milwaukee, WI01980-01-011980current
I-894.svg I-894 4.707.56 I-41/I-94 in Milwaukee, WII-41/I-43/I-94 in Milwaukee, WI01966-01-011966currentCompletely concurrent with I-41
I-395.svg I-395 54.6988.02 I-95 in East Lyme, CT I-290 in Auburn, MA 01983-01-011983current
I-295.svg I-295 92.30148.54 I-95/I-495 in New Castle, DE I-95 in Bristol Township, PA 01994-01-011994currentExtended into Pennsylvania in 2018
I-495.svg I-495 11.4718.46 I-95/I-295 in Newport, DE I-95 in Lower Chichester Township, PA 01977-01-011977current
I-895.svg I-895 01979-01-01197901980-01-011980Now part of I-95
I-395.svg I395 13.3921.55 I-95/I-495 in Springfield, VA US 50 in Washington, DC 01977-01-011977currentOriginal route of I-95 that was proposed to continue through Washington, DC
I-495.svg I495 64103Beltway around Washington, DC 01961-01-011961currentCapital Beltway; runs through Virginia, Maryland and a small sliver of Washington, DC, over the Wilson Bridge
I-695.svg I695 2.003.22 I-395 in Washington, DC I-295 in Washington, DC [18] 01958-01-011958current
I-195.svg I-195 4.427.11 I-95/SR 112 in Miami, FL SR 905 in Miami Beach, FL 01961-01-011961current
I-295.svg I-295 61.0498.23Beltway around Jacksonville, FL 01970-01-011970current
I-395.svg I-395 1.292.08 I-95 in Miami, FL MacArthur Causeway at Watson Island, Miami, FL01971-01-011971current
I-595.svg I-595 12.8620.70 I-75/SR 869 in Weston, FL US 1 in Fort Lauderdale, FL 01990-01-011990current
I-795.svg I-795 I-95 south of Jacksonville, FL I-295 in Jacksonville, FLproposedCurrently under construction; partially open as SR 9B but not yet signed as I-795
I-195.svg I195 1.552.49 I-95/Maine Turnpike in Saco, ME SR 5 in Saco, ME01980-01-011980current
I-295.svg I295 53.1185.47 I-95/Maine Turnpike in Scarborough, ME I-95/Maine Turnpike in Gardiner, ME 01960-01-011960current
I-395.svg I395 4.998.03 I-95/US 2/SR 100 in Bangor, ME US 1A in Brewer, ME 02008-01-012008current
I-495.svg I495 3.705.95 I-95/Maine Turnpike in Portland, ME I-295/US 1 in Falmouth, ME 02004-01-012004currentUnsigned
I-195.svg I-195 4.71 [19] 7.58 I-95/MD 166 near Catonsville, MD Baltimore-Washington International Airport 01990-01-011990current
I-395.svg I-395 1.983.19 I-95 in South Baltimore, MD West Pratt Street in Baltimore, MD01981-01-011981current
I-595.svg I-595 19.9732.14 I-95/I-495/US 50 near Washington, DC US 50/US 301/MD 70 in Annapolis, MD 02011-01-012011currentUnsigned designation for US 50
I-695.svg I-695 30.5749.20Beltway around Baltimore, MD 01958-01-011958current
I-795.svg I-795 8.9914.47 I-695 in Pikesville, MD MD 140 in Reisterstown, MD 01985-01-011985current
I-895.svg I-895 11.4418.41 I-95 near Elkridge, MD I-95 in Baltimore, MD 01979-01-011979current
I-295.svg I295 8.0512.96 I-95/I-495 near Forest Heights, MD I-695 in Washington, DC 01964-01-011964current
I-195.svg I195 44.5571.70 I-95 in Providence, RI I-495/Route 25 in Wareham, MA 01958-01-011958current
I-295.svg I295 26.5842.78 I-95 in Warwick, RI I-95 in Attleboro, MA 01969-01-011969current
I-495.svg I495 121.56195.63 I-195/Route 25 in Wareham, MA I-95 in Salisbury, MA 01957-01-011957current
I-695.svg I695 I-93 in Roxbury, MA I-93 in Charlestown, MA 01955-01-01195501971-01-011971Cancelled; was to have been built in connection with a planned alignment of I-95 through downtown Boston
I-895.svg I895 Route 37/I-295 in Cranston, RI I-95/I-295 in Attleboro, MA 01968-01-01196801982-01-011982Cancelled; would have supplemented I-295 to create a full Beltway around Providence, RI
I-195.svg I-195 34.1754.99 I-295 in Hamilton Township, NJ Route 34 in Wall Township, NJ 01968-01-011968current
I-895.svg I-895 I-295 in Burlington, NJ I-95 in Bristol, PA 01963-01-01196301981-01-011981Never built
I-295.svg I-295 7.7012.39 NY 25/NY 24 in Queens, NY Bruckner Interchange in Bronx, NY 01970-01-011970current
I-495.svg I-495 66.38106.83 Queens Midtown Tunnel in Manhattan, NY CR 58 in Riverhead, NY 01958-01-011958current
I-695.svg I-695 1.402.25 I-95 in Bronx, NY I-295 in Bronx, NY01986-01-011986current
I-895.svg I-895 1.121.80 I-278 in Bronx, NY I-95 in Bronx, NY01970-01-01197002017-01-012017 [20] Currently designated as NY 895
I-295.svg I-295 proposedPlanned route around the west side of Fayetteville, NC
I-495.svg I-495 4.106.60 I-440/US 64/US 64 Bus. in Raleigh, NC I-540/US 64/US 264 in Knightdale, NC 02013-01-01201302017-01-012017Now part of I-87
I-795.svg I-795 25.4640.97 US 70/US 117 in Goldsboro, NC I-95/US 264 in Wilson, NC 02007-01-012007current
I-695.svg I-695 I-95 near Philadelphia International Airport I-95 in Philadelphia, PA 01964-01-01196401977-01-011977Never built
I-195.svg I-195 3.245.21 SR 195 in Richmond, VA I-64/I-95 in Richmond, VA01970-01-011970current
I-295.svg I-295 52.5684.59 I-95 near Petersburg, VA I-64 near Short Pump, VA 01980-01-011980current
I-595.svg I-595 I-395 near Arlington, VA US 1 at Ronald Reagan Washington National Airport Now part of US 1
I-895.svg I-895 I-95 near Richmond, VA I-295 near Richmond, VA01996-01-01199602002-01-012002Currently designated as SR 895, it was originally planned as a Interstate designation, but did not get approved by AASHTO
I-495.svg I-495 01956-01-01195601958-01-011958Early number of I-476
I-196 (MI 1957).svg I-196 37.07 [11] 59.66 US 31 in Norton Shores, MI I-96/US 16 in Grand Rapids, MI 01959-01-01195901963-01-011963Now the western end of I-96
I-196.svg I-196 80.65129.79 I-94/US 31 near Benton Harbor, MI I-96/M-37 in Grand Rapids, MI 01963-01-011963current
I-296.svg I-296 3.435.52 I-196 in Grand Rapids, MI I-96/M-37 in Walker, MI 01962-01-011962currentUnsigned since 1979
I-496.svg I-496 11.7818.96 I-69/I-96 near Lansing, MI I-96 and US 127 near Lansing, MI01970-01-011970current
I-696.svg I-696 29.3947.30 I-96/I-275 & M-5 in Novi, MI I-94 in Roseville, MI 01989-01-011989current
I-197.svg I-197 3.445.54Replaced by I-595.
I-297.svg I-297 01987-01-011987Withdrawn from request, replaced by MD Route 3.
  •       Former
  •       Future

See also

Notes

  1. According to the FHWA, I-275 in Michigan is only 29.97 mi (48.23 km) because they do not count the length overlapping I-96. [3] MDOT and most major map publishers do count the overlap. [11] [12] [13]

Related Research Articles

United States Numbered Highway System highway system of the United States of America

The United States Numbered Highway System is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these highways were coordinated among the states, they are sometimes called Federal Highways, but the roadways were built and have always been maintained by state or local governments since their initial designation in 1926.

Interstate 97 (I-97) is a part of the Interstate Highway System that runs entirely within Anne Arundel County, Maryland. The intrastate Interstate runs 17.62 miles (28.36 km) from U.S. Route 50 (US 50) and US 301 in Parole near Annapolis north to I-695 and I-895 in Brooklyn Park near Baltimore. The Interstate is the primary highway between Baltimore and Annapolis. I‑97 connects Annapolis with Baltimore–Washington International Airport and links the northern Anne Arundel County communities of Crownsville, Millersville, Severna Park, Glen Burnie, and Ferndale. It is the second shortest primary Interstate Highway after I-87 in North Carolina.

Interstate 380 (I-380) is a short 1.7-mile (2.7 km) east–west spur Interstate Highway in the San Francisco Bay Area of Northern California, connecting Interstate 280 in San Bruno to U.S. Route 101 near the San Francisco International Airport (SFO). The highway primarily consists of only three intersections: I-280, El Camino Real, and U.S. 101. Like the nearby I-280, I-380 never connects to Interstate 80, its parent Interstate Highway. However, there is no rule that says that spur routes need to.

Interstate 196 (I-196) is an auxiliary Interstate Highway that runs for 80.6 miles (129.7 km) in the US state of Michigan. It is a state trunkline highway that links Benton Harbor, South Haven, Holland, and Grand Rapids together. In Kent, Ottawa, and Allegan counties, I-196 is known as the Gerald R. Ford Freeway, or simply the Ford Freeway, after the 38th President of the United States, Gerald Ford, who was raised in Grand Rapids and served Michigan in the House of Representatives. This name generally refers only to the section between Holland and Grand Rapids. I-196 changes direction; it is signed as a north–south highway from its southern terminus to the junction with US Highway 31 (US 31) just south of Holland, and as an east–west trunkline from this point to its eastern terminus at an interchange with I-96, its parent highway. There are currently three business routes related to the main freeway. There are two business loops and one business spur that serve South Haven, Holland and the Grand Rapids areas. Another business spur for Muskegon had been designated relative to the I-196 number.

Interstate 530 (I-530) in Arkansas is a spur route of the Interstate highway system, traveling 46.65 miles (75.08 km) from Pine Bluff north-northwest to Little Rock, at an interchange of I-30/I-440/US 65/US 67/US 167. The highway also travels through the cities of Redfield and White Hall.

Interstate 270 (I-270) is a 34.70-mile (55.84 km) auxiliary Interstate Highway in the U.S. state of Maryland that travels between I-495 just north of Bethesda, Montgomery County and I-70 in the city of Frederick in Frederick County. It consists of the 32.60-mile (52.46 km) mainline as well as a 2.10-mile (3.38 km) spur that provides access to and from southbound I-495. I-270 is known as the Washington National Pike, and makes up the easternmost stretch of the Dwight D. Eisenhower Memorial Highway. Most of the southern part of the route in Montgomery County passes through suburban areas around Rockville and Gaithersburg that are home to many biotech firms. This portion of I-270 is up to twelve lanes wide and consists of a local-express lane configuration as well as high-occupancy vehicle lanes that are in operation during peak travel times. North of the Gaithersburg area, the road continues through the northern part of Montgomery County, passing Germantown and Clarksburg as a six- to eight-lane highway with a HOV lane in the northbound direction only. North of here, I-270 continues through rural areas into Frederick County and toward the city of Frederick as a four-lane freeway.

Interstate 235 (I-235) in Kansas is a 16.52-mile-long (26.59 km) north–south bypass spur route of I-35 that travels through the western part of Wichita. Its northern terminus is at an interchange with K-96 and I-135/U.S. Highway 81 (I-135/US-81) north of the city, where the freeway continues east as K-254. The southern is at I-135/US-81 shortly before US-81 separates from I-135 and I-135 connects to I-35 at I-135's own southern terminus.

Texas state highways are a network of highways owned and maintained by the U.S. state of Texas. The Texas Department of Transportation (TxDOT) is the state agency responsible for the day-to-day operations and maintenance of the system. Texas has the largest state highway system, followed closely by North Carolina's state highway system. In addition to the nationally numbered Interstate Highways and U.S. Highways, the highway system consists of a main network of state highways, loops, spurs, and beltways that provide local access to the other highways. The system also includes a large network of farm to market roads that connect rural areas of the state with urban areas and the rest of the state highway system. The state also owns and maintains some park and recreational roads located near and within state and national parks, as well as recreational areas. All state highways, regardless of classification, are paved roads. The Old San Antonio Road, also known as the El Camino Real, is the oldest highway in the United States, first being blazed in 1691. The length of the highways varies from US 83's 893.4 miles (1,437.8 km) inside the state borders to Spur 200 at just 0.05 miles long.

The North Carolina Highway System consists of a vast network of Interstate, United States, and state highways, managed by the North Carolina Department of Transportation. North Carolina has the second largest state maintained highway network in the United States because all roads in North Carolina are maintained by either municipalities or the state. Since counties do not maintain roads, there is no such thing as a "county road" within the state.

Interstate 74 (I-74) is an Interstate Highway that is partially completed in the U.S. state of North Carolina. Currently in three distinct segments, when completed, it will traverse the state in a southeasterly direction from Virginia to South Carolina, connecting the cities of Winston-Salem, High Point, Asheboro, Rockingham, and Lumberton.

Special route United States road in a numbered highway system that diverts a specific segment of related traffic away from another road

In road transportation in the United States, a special route is a road in a numbered highway system that diverts a specific segment of related traffic away from another road. They are featured in many highway systems; most are found in the Interstate Highway System, U.S. highway system, and several state highway systems. Each type of special route possesses generally defined characteristics and has a defined relationship with its parent route. Typically, special routes share a route number with a dominant route, often referred as the "parent" or "mainline", and are given either a descriptor which may be used either before or after the route name, such as Alternate or Business, or a letter suffix that is attached to the route number. For example, an alternate route of U.S. Route 1 may be called "Alternate U.S. Route 1", "U.S. Route 1 Alternate", or "U.S. Route 1A". Occasionally, a special route will have both a descriptor and a suffix, such as U.S. Route 1A Business.

Delaware State Route System highway system

The Delaware State Route System consists of roads in the U.S. state of Delaware that are maintained by the Delaware Department of Transportation (DelDOT). The system includes the portions of the Interstate Highway System and United States Numbered Highways system located in the state along with state routes and other roads maintained by DelDOT. All roads maintained by the state are assigned a maintenance road number that is only marked on little white markers at intersections and on auxiliary plates below warning signs approaching intersections. These numbers are only unique in a specific county, some roads can be designated with multiple road numbers, and numbers do not necessarily correspond to the signed Interstate, U.S., or state route numbers. DelDOT maintains a total of 5,386.14 miles (8,668.15 km) of roads, comprising 89 percent of the roads within the state. Some large bridges in the state are maintained by other agencies including the U.S. Army Corps of Engineers and the Delaware River and Bay Authority. Roads in the system include multilane freeways, multilane surface divided highways, and two-lane undivided roads serving urban, suburban, and rural areas. Some of the roads maintained by DelDOT are toll roads, in which motorists must pay to use.

References

  1. Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). Retrieved March 16, 2012.
  2. 1 2 3 DeSimone, Tony (October 31, 2002). "Interstate Route Numbering". Route Log and Finder List. Federal Highway Administration. Retrieved February 3, 2008.
  3. 1 2 Adderly, Kevin (December 31, 2015). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved February 6, 2016.
  4. Special Committee on U.S. Route Numbering (December 8, 1990). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived (PDF) from the original on October 16, 2017.
  5. Warring, KS (January 2, 2008). "Interstate 905 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. Sacramento: California Department of Transportation. Retrieved February 5, 2009.
  6. Cavanaugh, Patricia (October 2006). "Politics and Freeways: Building the Twin Cities Interstate System". University of Minnesota.
  7. Tennessee Department of Transportation (October 31, 2003). "TDOT Announces Decision on State Route 840 North" (PDF) (Press release). Tennessee Department of Transportation. Archived from the original (PDF) on November 27, 2007.
  8. Federal Highway Administration (October 31, 2002). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration. Retrieved July 8, 2007.
  9. Dozier, Daniel A. (September 5, 2013). "Request for I-69 Designation for I-164 from I-64 to US 41" (PDF) (Letter). Letter to Richard J. Marquis. Indianapolis: Indiana Department of Transportation. Archived from the original (PDF) on March 4, 2016. Retrieved January 9, 2015 via American Association of State Highway and Transportation Officials.
  10. Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved March 2, 2012.
  11. 1 2 3 Michigan Department of Transportation & Michigan Center for Shared Solutions and Technology Partnerships (2009). MDOT Physical Reference Finder Application (Map). Michigan Department of Transportation. Retrieved February 6, 2016.
  12. Rand McNally (2008). "Michigan: Cities" (Map). The Road Atlas. 1 in≈5 mi. Chicago: Rand McNally. p. 52. Detroit & Vicinity inset. § I3. ISBN   0-528-93981-5. OCLC   226315010.
  13. Google (February 24, 2010). "Overview Map of I-275" (Map). Google Maps . Google. Retrieved February 24, 2010.
  14. "Ask SAM: Upgrades needed before US 52 can be called I-285". Winston-Salem Journal . January 10, 2014. Retrieved January 10, 2014.
  15. "NCDOT: Project U-2826". Archived from the original on October 29, 2011. Retrieved April 17, 2014.
  16. "State Seeking Future Interstate Designation for US 264 to Greenville". North Carolina Governor's Office (Press release). Retrieved November 10, 2016.
  17. Borggren, Erica J. (October 6, 2014). "I 490 Illinois Establish" (PDF). Archived from the original (PDF) on March 3, 2016.
  18. DeBonis, Mike (November 28, 2011). "Interstate 695 Reappears in D.C." The Washington Post.
  19. Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 24, 2012.
  20. Special Committee on U.S. Route Numbering (September 24, 2017). "Special Committee on U.S. Route Numbering" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 4. Archived (PDF) from the original on June 3, 2019. Retrieved October 21, 2017.