List of Interstate Highways

Last updated

Dwight D. Eisenhower National System of Interstate and Defense Highways
I-90.svg
MUTCD M1-10.svg
Highway shield for Interstate 90 and the Eisenhower Interstate System
List of Interstate Highways
Primary Interstate Highways in the 48 contiguous states as of 2022
System information
FormedJune 29, 1956 [1]
Highway names
Interstates Interstate X (I-X)
System links

There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south–north, with lower numbers in the west and higher numbers in the east; even-numbered Interstates run west–east, with lower numbers in the south and higher numbers in the north. Route numbers divisible by 5 usually represent major coast-to-coast or border-to-border routes (ex. I-10 connects Santa Monica, California to Jacksonville, Florida, extending between the Pacific and Atlantic oceans). Auxiliary highways have an added digit prefixing the number of the parent highway.

Contents

Five route numbers are duplicated in the system; the corresponding highways are in different regions, reducing potential confusion. In addition to primary highways in the contiguous United States, there are signed Interstates in Hawaii and unsigned Interstates in Alaska and Puerto Rico.

Contiguous United States

There are 71 primary interstate highways in the 48 contiguous United States as well as five former and one future primary interstate highways. This number does not include auxiliary Interstate Highways.

NumberLength (mi) [2] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-2.svg I-2 46.8075.32 BL US 83 in Peñitas, Texas I-69E/US 77/US 83 in Harlingen, Texas 02013-01-012013currentUnfinished in Texas; Texas only
I-4.svg I-4 132.30212.92 I-275 in Tampa, Florida I-95/SR 400 in Daytona Beach, Florida 01959-01-011959currentFlorida only
I-5.svg I-5 1381.292,222.97 Fed. 1/Fed. 1D at Mexican border in San Ysidro, California Hwy 99 at Canadian border in Blaine, Washington 01956-01-011956currentServes three states: California, Oregon, Washington
Associated routes: I-105, I-205, I-305, I-405, I-505, I-605, I-705, I-805; Planned: I-905 in California
I-8.svg I-8 348.25560.45Sunset Cliffs Boulevard/Nimitz Boulevard in San Diego, California I-10 in Casa Grande, Arizona 01964-01-011964currentServes two states: California, Arizona
I-10.svg I-10 2460.343,959.53 SR 1 in Santa Monica, California I-95/US 17/SR 15/SR 228 in Jacksonville, Florida 01957-01-011957currentServes eight states: California, Arizona, New Mexico, Texas, Louisiana, Mississippi, Alabama, Florida
Associated routes: I-110, I-210, I-310, I-410, I-510, I-610, I-710, I-910
I-11.svg I-11 53.9086.74 US 93 at Arizona state line near Boulder City, Nevada US 95/SR 157 in Las Vegas, Nevada 02017-01-012017currentUnfinished in Nevada; Nevada only; planned in one more: Arizona
I-12.svg I-12 85.59137.74 I-10 in Baton Rouge, Louisiana I-10/I-59 in Slidell, Louisiana 01967-01-011967currentLouisiana only
I-14.svg I-14 25.1040.39 US 190/US 190 Bus in Copperas Cove, Texas I-35/US 190 in Belton, Texas 02017-01-262017currentUnfinished in Texas; Texas only; planned in four more: Louisiana, Mississippi, Alabama, Georgia
Planned associated routes: I-14N, I-14S, and I-214 in Texas
I-15.svg I-15 1433.522,307.03 I-8/SR 15 in San Diego, California Highway 4 at Canadian border in Sweetgrass, Montana 01957-01-011957currentUnfinished in California; serves six states: California, Nevada, Arizona, Utah, Idaho, Montana
Associated routes: I-115, I-215, I-315
I-16.svg I-16 166.81268.45 I-75/SR 540 in Macon, Georgia Montgomery Street in Savannah, Georgia 01966-01-011966currentGeorgia only
Associated route: I-516
I-17.svg I-17 145.76234.58 I-10/US 60 in Phoenix, Arizona I-40/SR 89A in Flagstaff, Arizona 01961-01-011961currentArizona only
I-19.svg I-19 63.35101.95 I-19 Bus. in Nogales, Arizona I-10 in Tucson, Arizona 01972-01-011972currentArizona only
Uses kilometers instead of miles
I-20.svg I-20 1539.382,477.39 I-10 in Reeves County, Texas I-95/I-20 Bus. in Florence, South Carolina 01957-01-011957currentServes six states: Texas, Louisiana, Mississippi, Alabama, Georgia, South Carolina
Associated routes: I-220, I-520, I-820
I-22.svg I-22 202.22325.44 I-269/US 78/MS 304 near Byhalia, Mississippi I-65 in Birmingham, Alabama 02012-01-012012currentUnfinished in Alabama; serves two states: Mississippi, Alabama
Planned associated routes: I-222 and I-422 in Alabama
I-24.svg I-24 316.36509.13 I-57 in Pulley's Mill, Illinois I-75 in Chattanooga, Tennessee 01962-01-011962currentServes four states: Illinois, Kentucky, Tennessee, Georgia
Associated route: I-124
I-25.svg I-25 1061.671,708.59 I-10/US 85/US 180 in Las Cruces, New Mexico I-90/US 87 in Buffalo, Wyoming 01957-01-011957currentServes three states: New Mexico, Colorado, Wyoming
Associated route: I-225
I-26.svg I-26 304.64490.27 US 11W/US 23/SR 137 in Kingsport, Tennessee US 17 in Charleston, South Carolina 01960-01-011960currentUnfinished in North Carolina; serves three states: Tennessee, North Carolina, South Carolina
Associated routes: I-126, I-526
I-27.svg I-27 124.13199.77 US 87/Loop 289 in Lubbock, Texas I-40/US 87/US 287/US 60 in Amarillo, Texas 01969-01-011969currentUnfinished in Texas; Texas only; planned in one more: New Mexico
I-29.svg I-29 755.511,215.88 I-35/I-70/US 24/US 40/US 71 in Kansas City, Missouri US 81 and PTH 75 at Canadian border in Pembina, North Dakota 01958-01-011958currentServes four states: Missouri, Iowa, South Dakota, North Dakota
Associated routes: I-129, I-229
I-30.svg I-30 366.76590.24 I-20 in Fort Worth, Texas I-40/US 65/US 67/US 167 in North Little Rock, Arkansas 01957-01-011957currentServes two states: Texas, Arkansas
Associated routes: I-430, I-530, I-630
I-31.svg I-31 —— I-94 in Fargo, North Dakota US 81 and PTH 75 at Canadian border in Pembina, North Dakota 01957-01-01195701958-01-011958Served North Dakota only
Replaced by a northward extension of I-29
I-35.svg I-35 1568.382,524.06 US 83/Victoria Street in Laredo, Texas MN 61/LSCT/26th Avenue in Duluth, Minnesota 01956-01-011956currentServes six states: Texas, Oklahoma, Kansas, Missouri, Iowa, Minnesota
Associated routes: I-35E, I-35W, I-135, I-235, I-335, I-435, I-535, I-635
I-37.svg I-37 143.00230.14 US 181 in Corpus Christi, Texas I-35/US 281 in San Antonio, Texas 01959-01-011959currentTexas only
I-39.svg I-39 306.14492.68 I-55 in Normal, Illinois WIS 29/US 51 in Wausau, Wisconsin 01984-01-011984currentServes two states: Illinois, Wisconsin
I-40.svg I-40 2556.614,114.46 I-15 in Barstow, California US 117/NC 132 in Wilmington, North Carolina 01964-01-011964currentServes eight states: California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, North Carolina
Associated routes: I-140, I-240, I-440, I-540, I-640, I-840
I-41.svg I-41 175.00281.64 I-94/US 41 in Russell, Illinois I-43/US 41/US 141 in Howard, Wisconsin 02015-01-012015currentServes two states: Illinois, Wisconsin
I-42.svg I-42 190310 I-35 in Noble County, Oklahoma I-49 in Springdale, Arkansas proposed—Future Interstate; will serve two states: Oklahoma, Arkansas
I-42.svg I-42 31.550.7 I-40/US 70 in Garner, North Carolina US 70 in Goldsboro, North Carolina 02024-01-012024currentUnfinished in North Carolina; North Carolina only
I-43.svg I-43 191.55308.27 I-39/I-90 in Beloit, Wisconsin I-41/US 41/US 141 in Howard, Wisconsin 01981-01-011981currentWisconsin only
I-44.svg I-44 636.691,024.65 US 82/US 277/US 281/US 287 in Wichita Falls, Texas I-70 in St. Louis, Missouri 01958-01-011958currentServes three states: Texas, Oklahoma, Missouri
Associated routes: I-244, I-344, I-444
I-45.svg I-45 284.91458.52 SH 87 in Galveston, Texas I-30/US 67/US 75 in Dallas, Texas 01971-01-011971currentTexas only
Associated route: I-345
I-49.svg I-49 528.02849.77 I-10/US 167/LA 182 in Lafayette, Louisiana I-435/I-470/US 50/US 71 in Kansas City, Missouri 01984-01-011984currentUnfinished in Arkansas and Louisiana; serves three states: Louisiana, Arkansas, Missouri; planned in one more: Texas
I-55.svg I-55 964.251,551.81 I-10 in LaPlace, Louisiana US 41 in Chicago, Illinois 01960-01-011960currentServes six states: Louisiana, Mississippi, Tennessee, Arkansas, Missouri, Illinois
Associated routes: I-155, I-255, I-355, I-555
I-57.svg I-57 386.12621.40 I-55 in Miner, Missouri I-94 in Chicago, Illinois 01965-01-011965currentUnfinished in Missouri; serves two states: Missouri, Illinois; planned in one more: Arkansas
I-59.svg I-59 445.23716.53 I-10/I-12 in Slidell, Louisiana I-24 in Wildwood, Georgia 01960-01-011960currentServes four states: Louisiana, Mississippi, Alabama, Georgia
Associated routes: I-359, I-459, I-759
I-64.svg I-64 963.521,550.64 I-70/US 61 in Wentzville, Missouri I-264/I-664 in Chesapeake, Virginia 01961-01-011961currentServes six states: Missouri, Illinois, Indiana, Kentucky, West Virginia, Virginia
Associated routes: I-264, I-464, I-564, I-664
I-65.svg I-65 887.301,427.97 I-10 in Mobile, Alabama US 12/US 20 in Gary, Indiana 01958-01-011958currentServes four states: Alabama, Tennessee, Kentucky, Indiana
Associated routes: I-165, I-265, I-465, I-565, I-865; Planned: I-365 in Kentucky
I-66.svg I-66 —— Wichita, Kansas Near Pikeville, Kentucky 01991-01-01199102015-01-012015 [3] Served four states: Kansas, Missouri, Illinois, Kentucky
Associated routes: I-66 Spur in Kentucky
The project was unpopular and ultimately cancelled without the interstate being completed; I-66 Spur eventually became I-165
I-66.svg I-66 76.28122.76 I-81 in Front Royal, Virginia US 29 in Washington, D.C. 01961-01-011961currentServes DC and one state: Virginia
I-68.svg I-68 113.15182.10 I-79 in Morgantown, West Virginia I-70 in Hancock, Maryland 01991-01-011991currentServes two states: West Virginia, Maryland
I-69.svg I-69 879.821,415.93 US 59 in Rosenberg, Texas Highway 402 at Canadian border in Port Huron, Michigan 01957-01-011957currentUnfinished in Texas, Mississippi, Kentucky, and Indiana; serves six states: Texas, Mississippi, Kentucky, Indiana, Michigan. Planned/started in 3 more: Louisiana, Arkansas, Tennessee
Associated routes: I-69C, I-69E, I-69W, I-169, I-269, I-369, I-469; Planned: I-569 in Kentucky
I-70.svg I-70 2172.163,495.75 I-15 in Cove Fort, Utah I-695 in Woodlawn, Maryland 01956-01-011956currentServes 10 states: Utah, Colorado, Kansas, Missouri, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, Maryland
Associated routes: I-170, I-270, I-370, I-470, I-670
I-71.svg I-71 345.57556.14 I-64 in Louisville, Kentucky I-90 in Cleveland, Ohio 01959-01-011959currentServes two states: Kentucky, Ohio
Associated routes: I-271, I-471
I-72.svg I-72 179.29288.54 US 61 in Hannibal, Missouri Church Street and University Avenue in Champaign, Illinois 01970-01-011970currentServes two states: Missouri, Illinois
Associated route: I-172
I-73.svg I-73 99.43160.02 US 220 near Stokesdale, North Carolina I‑74 and US 220 in Randleman, North Carolina 01997-01-011997currentUnfinished in North Carolina; North Carolina only; planned in five more: South Carolina, Virginia, West Virginia, Ohio, Michigan
I-74.svg I-74 491.74791.38 I-80 in Bettendorf, Iowa US 74/NC 41 near Lumberton, North Carolina 01974-01-011974currentUnfinished in Ohio and North Carolina; serves five states: Iowa, Illinois, Indiana, Ohio, North Carolina; planned in three more: West Virginia, Virginia, South Carolina
Associated routes: I-474; Planned: I-274 in North Carolina
I-75.svg I-75 1786.472,875.04 SR 826/SR 916/SR 924 in Miami Lakes, Florida Canadian border at Sault Ste. Marie, Michigan 01958-01-011958currentServes six states: Florida, Georgia, Tennessee, Kentucky, Ohio, Michigan
Associated routes: I-175, I-275, I-375, I-475, I-575, I-675
I-76.svg I-76 186.48300.11 I-70 at Denver, Colorado I-80 at Big Springs, Nebraska 01975-01-011975currentServes two states: Colorado, Nebraska
I-76.svg I-76 435.66701.13 I-71 in Westfield Center, Ohio I-295 at Bellmawr, New Jersey 01964-01-011964currentServes three states: Ohio, Pennsylvania, New Jersey
Associated routes: I-176, I-276, I-376, I-476, I-676
I-77.svg I-77 610.10981.86 I-26 in Columbia, South Carolina I-90 in Cleveland, Ohio 01958-01-011958currentServes five states: South Carolina, North Carolina, Virginia, West Virginia, Ohio
Associated route: I-277
I-78.svg I-78 146.28235.41 I-81 at Jonestown, Pennsylvania Canal Street in New York City 01957-01-011957currentServes three states: Pennsylvania, New Jersey, New York
Associated routes: I-278, I-478, I-678, I-878
I-79.svg I-79 343.46552.75 I-77 in Charleston, West Virginia PA 5 in Erie, Pennsylvania 01967-01-011967currentServes two states: West Virginia, Pennsylvania
Associated routes: I-279, I-579
I-80.svg I-80 2899.594,666.44 US 101 in San Francisco, California I-95 in Teaneck, New Jersey 01956-01-011956currentServes 11 states: California, Nevada, Utah, Wyoming, Nebraska, Iowa, Illinois, Indiana, Ohio, Pennsylvania, New Jersey
Associated routes: I-180, I-238, I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-980
I-81.svg I-81 855.021,376.02 I-40 in Dandridge, Tennessee Hwy 137 at Canadian border on Wellesley Island, New York 01961-01-011961currentServes six states: Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New York
Associated routes: I-381, I-481, I-581, I-781
I-82.svg I-82 143.58231.07 I-90 in Ellensburg, Washington I-84 in Hermiston, Oregon 01957-01-011957currentServes two states: Washington, Oregon
Associated route: I-182
I-82.svg I-82 —— I-81/I-84/US 6 in Scranton, Pennsylvania I-95 in Teaneck, New Jersey 01957-01-01195701958-01-011958Served two states: Pennsylvania, New Jersey
Was the initial designation to what is now I-380 and I-80
I-82.svg I-82 —— I-84 in East Hartford, Connecticut Providence, Rhode Island 01956-01-01195601968-01-011968Served one state: Connecticut, was planned for one state: Rhode Island
Redesignated as I-84 in 1968
I-83.svg I-83 85.03136.84President Street and Fayette Street in Baltimore, Maryland I-81 in Harrisburg, Pennsylvania 01959-01-011959currentServes two states: Maryland, Pennsylvania
Associated route: I-283
I-84.svg I-84 769.621,238.58 I-5 in Portland, Oregon I-80 in Echo, Utah 01980-01-011980currentServes three states: Oregon, Idaho, Utah
Associated route: I-184
I-84.svg I-84 232.71374.51 I-81 in Scranton, Pennsylvania I-90 in Sturbridge, Massachusetts 01963-01-011963currentServes four states: Pennsylvania, New York, Connecticut, Massachusetts
Associated routes: I-384, I-684
I-85.svg I-85 666.051,071.90 I-65 in Montgomery, Alabama I-95 in Petersburg, Virginia 01958-01-011958currentUnfinished in Alabama; serves five states: Alabama, Georgia, South Carolina, North Carolina, Virginia
Associated routes: I-185, I-285, I-385, I-485, I-585, I-785, I-885, I-985; Future/Planned: I-685 in both Alabama and North Carolina
I-86.svg I-86 62.85101.15 I-84 near Declo, Idaho I-15 in Chubbuck, Idaho 01980-01-011980currentIdaho only
I-86.svg I-86 223.39359.51 I-90 near North East, Pennsylvania NY 17/NY 79 in Windsor, New York 01999-01-011999currentUnfinished in New York; serves two states: Pennsylvania, New York
I-86.svg I-86 38.9762.72 I-84 in East Hartford, Connecticut I-90 in Sturbridge, Massachusetts 01968-01-01196801984-01-011984Served two states: Connecticut, Massachusetts
Redesignated as I-84 in 1984 when the I-84 Hartford-Providence corridor was cancelled
I-87.svg I-87 12.9020.76 I-40/I-440/US 64/US 264 in Raleigh, North Carolina US 64/US 264 in Wendell, North Carolina 02017-01-012017currentUnfinished in North Carolina; North Carolina only; planned in one more: Virginia
Associated route: I-587
Shortest Interstate highway in contiguous United States
I-87.svg I-87 333.49536.70 I-278 in New York City A-15 at Canadian border in Champlain, New York 01957-01-011957currentNew York only
Associated routes: I-287, I-587, I-787
I-88.svg I-88 140.60226.27 I-80/IL 92 in East Moline, Illinois I-290/IL 110 in Hillside, Illinois 01987-01-011987currentIllinois only
I-88.svg I-88 117.75189.50 I-81 in Binghamton, New York I-90 in Schenectady, New York 01968-01-011968currentNew York only
I-89.svg I-89 191.12307.58 I-93/SR 3A in Bow, New Hampshire Route 133/Future A-35 at Canadian border in Highgate, Vermont 01960-01-011960currentServes two states: New Hampshire, Vermont
Associated route: I-189
I-90.svg I-90 3020.444,860.93 SR 519/4th Avenue/Edgar Martinez Drive in Seattle, Washington MA 1A in Boston, Massachusetts 01956-01-011956currentServes 13 states: Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts
Associated routes: I-190, I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-990
Longest Interstate highway
I-91.svg I-91 290.37467.31 I-95/Route 34 in New Haven, Connecticut A-55 at Canadian border in Derby Line, Vermont 01958-01-011958currentServes three states: Connecticut, Massachusetts, Vermont
Associated routes: I-291, I-391, I-691
I-93.svg I-93 189.95305.69 I-95/US 1 in Canton, Massachusetts I-91 in St. Johnsbury, Vermont 01957-01-011957currentServes three states: Massachusetts, New Hampshire, Vermont
Associated routes: I-293, I-393
I-94.svg I-94 1585.202,551.13 I-90 in Lockwood, Montana Highway 402 at Canadian border in Port Huron, Michigan 01956-01-011956currentServes seven states: Montana, North Dakota, Minnesota, Wisconsin, Illinois, Indiana, Michigan
Associated routes: I-194, I-294, I-394, I-494, I-694, I-794, I-894
I-95.svg I-95 1919.313,088.83 US 1 in Miami, Florida NB 95 at Canadian border in Houlton, Maine 01957-01-011957currentServes DC and 15 states: Florida, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Maine
Associated routes: I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-895
Longest primary north-south Interstate highway
I-96.svg I-96 192.06309.09 US 31 in Norton Shores, Michigan I-75 in Detroit, Michigan 01959-01-011959currentMichigan only
Associated routes: I-196, I-296, I-496, I-696
I-97.svg I-97 17.6228.36 US 50/US 301 in Annapolis, Maryland I-695/I-895A in Glen Burnie, Maryland 01987-01-011987currentMaryland only
I-99.svg I-99 98.34158.26 I-70/I-76 in Bedford, Pennsylvania I-86/NY 17 in Painted Post, New York 01998-01-011998currentUnfinished in Pennsylvania; serves two states: Pennsylvania, New York
  •       Former
  •       Proposed and unbuilt

Other regions

In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System. However, these routes are not required to meet the same standards as the mainland routes:

Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway. [4]

Hawaii

List of Interstate Highways
Map of Hawaii's Interstate Highways (excluding H-201)

The Interstate Highways on the island of Oʻahu, Hawaii are signed with the standard Interstate Highway shield, with the letter "H-" prefixed before the number. They are fully controlled-access routes built to the same standards as the mainland Interstate Highways.

NumberLength (mi) [2] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-H1.svg H-1 27.1643.71 Route 93 in Kapolei Route 72 in Honolulu 01960-01-011960currentAssociated route: H-201
I-H2.svg H-2 8.3313.41 H-1 in Pearl City Route 99 in Wahiawa 01960-01-011960current
I-H3.svg H-3 15.3224.66 H-1/H-201 in Halawa Marine Corps Base Hawaii 01997-01-011997current

Alaska

List of Interstate Highways
Map of Alaska's Interstate Highways

Alaska's Interstate Highways are unsigned as such, although they all have state highway numbers that do not match the Interstate Highway numbers. [5]

NumberLength (mi) [2] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-A1.svg A-1 408.23656.98 Anchorage Canadian border in Alcan Border 01976-01-011976current Glenn Highway, Richardson Highway, Tok Cut-Off, Alaska Highway [6] [7] [8] [9]
I-A2.svg A-2 202.18325.38 Tok Fairbanks 01976-01-011976current Alaska Highway, Richardson Highway [7] [8] [9]
I-A3.svg A-3 148.12238.38 Anchorage Soldotna 01976-01-011976current Seward Highway, Sterling Highway [6] [8] [9]
I-A4.svg A-4 323.69520.93 Gateway, near Palmer Fairbanks 01976-01-011976current Parks Highway [6] [7] [8] [9]

Puerto Rico

Map of the Interstates in Puerto Rico Puerto Rico Interstates.svg
Map of the Interstates in Puerto Rico

Puerto Rico signs its Interstate Highways as territorial routes, as the numbers do not match their official Interstate Highway designations. Many of the territory's routes are freeway-standard toll roads. [10]

NumberLength (mi) [2] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-PR1.svg PR-1 71.08114.39 PR-2 in Ponce PR-2 in San Juan 01976-01-011976currentFollows PR-52
I-PR2.svg PR-2 138.13222.30 PR-1 in Ponce PR-3 in San Juan 01976-01-011976currentFollows PR-22
I-PR3.svg PR-3 40.5665.27 PR-3 in Humacao PR-2 in San Juan 01976-01-011976currentFollows PR-66

See also

Related Research Articles

<span class="mw-page-title-main">Interstate Highway System</span> Network of freeways in the United States

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

<span class="mw-page-title-main">Interstate 585</span> Highway in South Carolina

Interstate 585 (I-585) is a 2.25-mile-long (3.62 km) auxiliary Interstate Highway of I-85 in the US state of South Carolina. It is an orphan auxiliary route to I-85 since 1995 when the Interstate was relocated further north bypassing Spartanburg. In a concurrency with US Highway 176 (US 176) throughout, it spurs south from I-85 Business for a couple of miles before entering Spartanburg.

<span class="mw-page-title-main">Interstate 296</span> Unsigned Interstate Highway in Michigan, United States

Interstate 296 (I-296) is a part of the Interstate Highway System in the US state of Michigan. It is a north–south state trunkline highway that runs for 3.43 miles (5.52 km) entirely within the Grand Rapids area. Its termini are I-196 near downtown Grand Rapids and I-96 on the north side of Grand Rapids in Walker. For most of its length, the Interstate runs concurrently with U.S. Highway 131 (US 131), which continues as a freeway built to Interstate Highway standards north and south of the shorter I-296. The highway was first proposed in the late 1950s and opened in December 1962, but the Michigan Department of Transportation (MDOT) has since eliminated all signage for I-296 and removed the designation from their official state map. The designation is therefore unsigned, but still listed on the Interstate Highway System route log maintained by the Federal Highway Administration (FHWA).

<span class="mw-page-title-main">Interstate H-201</span> Interstate Highway in Hawaii, US

Interstate H-201 is the only auxiliary Interstate Highway located outside the contiguous United States, serving the island of Oʻahu in the US state of Hawaii. The 4.1-mile-long (6.6 km) loop route connects exits 13 and 19 on H-1, passing Fort Shafter, Tripler Army Medical Center, and the Red Hill Underground Fuel Storage Facility.

<span class="mw-page-title-main">Interstate 180 (Wyoming)</span> Interstate Highway in Cheyenne, Wyoming, United States

Interstate 180 (I-180) is a 1.09-mile-long (1.75 km) expressway in the US state of Wyoming between I-80 and downtown Cheyenne.

<span class="mw-page-title-main">Unsigned highway</span> Highways that do not identify the route number

An unsigned highway is a highway that has been assigned a route number, but does not bear road markings that would conventionally be used to identify the route with that number. Highways are left unsigned for a variety of reasons, and examples are found throughout the world. Depending on the policy of the agency that maintains the highway, and the reason for not signing the route, the route may instead be signed a different designation from its actual number, with small inventory markers for internal use, or with nothing at all.

<span class="mw-page-title-main">Roads in Puerto Rico</span>

Puerto Rico has approximately 14,400 kilometers (8,900 mi) of national, forest and municipal roads. The highways serve the more than 3 million residents, and 3-4 million tourists who visit each year.

References

  1. ↑ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. 60 (1). Washington, DC: Federal Highway Administration . Retrieved March 16, 2012.
  2. 1 2 3 4 "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of December 31, 2018". FHWA Route Log and Finder List. Federal Highway Administration. May 6, 2019. Retrieved April 21, 2021.
  3. ↑ Nelsen, Carrie (July 9, 2015). "For Immediate Release" (PDF) (Press release). Illinois Department of Transportation. Archived from the original (PDF) on September 6, 2015.
  4. ↑ Staff. "FHWA Route Log and Finder List". Federal Highway Administration. Retrieved May 24, 2007.
  5. ↑ Voss, Oscar. "Alaska Roads: Interstate ends photos" . Retrieved May 24, 2007.
  6. 1 2 3 Witt, Jennifer W. (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on March 30, 2014. Retrieved March 15, 2012.
  7. 1 2 3 Birkholz, Ethan (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
  8. 1 2 3 4 Staff. "Dwight D. Eisenhower Interstate Routes Statewide" (PDF). Federal Highway Administration. Retrieved May 31, 2012.
  9. 1 2 3 4 Staff. "Alaska Department of Transportation and Public Facilities Routes by Description: CDS Route Numbers as of 28 October 2008" (PDF). Federal Highway Administration. Retrieved May 31, 2012.
  10. ↑ Voss, Oscar. "Puerto Rico road photos" . Retrieved May 24, 2007.
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