|Length||3,020.44 mi (4,860.93 km)|
|West end||SR 519 in Seattle, WA|
|East end||Route 1A /Logan International Airport in Boston|
|States||Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts|
Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at 3,020.44 miles (4,860.93 km). Its western terminus is in Seattle, Washington, at State Route 519 near T-Mobile Park and Lumen Field, and its eastern terminus is in Boston, Massachusetts, at Route 1A near Logan International Airport.
The western portion of I-90 crosses the Continental Divide over Homestake Pass just east of Butte, Montana, connecting major cities such as Spokane, Washington; Billings, Montana; Sioux Falls, South Dakota; and Madison, Wisconsin.
Between Seattle and Beloit, Wisconsin, I-90 is an Interstate without tolls. East of South Beloit, Illinois, much of I-90 follows several toll roads, many of which predate the Interstate Highway system. These include the Jane Addams Memorial Tollway, Chicago Skyway, Indiana Toll Road, Ohio Turnpike, New York State Thruway, and the Massachusetts Turnpike. The Interstate is not tolled through some segments in downtown Chicago; Greater Cleveland and the rest of Northeast Ohio; Erie and the rest of Northwestern Pennsylvania; and through brief sections near Buffalo and Albany in New York state.
The western I-90 terminus is in the SoDo neighborhood of Seattle. I-90 eastbound begins at exit 2B, Edgar Martínez Drive S (State Route 519) and 4th Avenue S. I-90 westbound exit 2B ends at Edgar Martínez Dr and 4th Ave near T-Mobile Park, as well as 4th Ave just north of S. Royal Brougham Way near CenturyLink Field, about a block east of the entrance to the Port of Seattle's container shipping terminal at Pier 46.
The tunnel that carries I-90 under the Mount Baker Ridge is on the National Register of Historic Places. The east portal of the tunnel (visible when entering Seattle from the east) is constructed as a bas-relief concrete sculpture.
I-90 incorporates two of the longest floating bridges in the world, the Lacey V. Murrow Memorial Bridge and the Homer M. Hadley Memorial Bridge, which cross Lake Washington from Seattle to Mercer Island. They are the second and fifth longest such bridges, respectively.
Forty miles (64 km) east of Bellevue, I-90 traverses the Cascade Range's Snoqualmie Pass, elevation 3,022 feet (921 m). It intersects I-82 shortly after exiting the mountains and crosses the Columbia River on the Vantage Bridge at mile post 137. After entering Spokane near mile post 279, it enters Idaho 18 miles (29 km) later.
The Washington section of I-90 is defined in the Revised Code of Washington (RCW 47.17.140).
The small town of Wallace still prides itself on having what was the last stop light in the Rocky Mountains on I-90.Its downtown has many historical buildings that would have been wiped out by the original planned route of the freeway, so in 1976, city leaders had the downtown placed on the National Register of Historic Places. As a result, the federal government was forced, at great expense, to reroute the freeway to the northern edge of downtown and elevate it. That section of I-90 opened in September 1991. A bicycle path is routed beneath part of that segment.
In the period between 1995 and 1999, there was no numbered speed limit on I-90 in Montana. The speed limit was simply defined as "reasonable and prudent" as determined on a case-by-case basis by the Montana Highway Patrol. The speed limit in Montana is now 80 mph (130 km/h). From the west I-90 enters Montana on the summit of Lookout Pass. It passes next to Missoula and runs through Butte, where it connects with I-15 for close to eight miles (13 km), before crossing the continental divide just east of Butte where it goes over Homestake Pass, which is 6,329 feet (1,929 m) in elevation, the highest point for the Interstate.
It passes between the Gallatin and Bridger mountain ranges over Bozeman Pass between Bozeman and Livingston. It follows the Yellowstone River from Livingston to Billings where it connects the suburbs of Laurel and Lockwood with the rest of the Billings area. In Lockwood it intersects with I-94's western terminus and turns south. South of Hardin it passes the site of the Battle of the Little Bighorn (Custer's Last Stand) at Crow Agency on the Crow Indian Reservation. Montana boasts the longest stretch of I-90, ranging just over 551 miles (887 km).
I-90 enters the state of Wyoming from the north after splitting off from I-94 in Billings, Montana. The first major town is Sheridan where it heads southbound. It then follows the foothills of the Bighorn Mountains between Sheridan and Buffalo where it then intersects with I-25, where the route goes from a north–south orientation to an east–west orientation. It then goes across the Powder River Basin toward Gillette, Moorcroft, and Sundance where it shares alignments with both US 14 and US 16.
Near the Black Hills, I-90 leaves Wyoming and enters South Dakota between Sundance and Spearfish, South Dakota where it proceeds southeast toward Rapid City, South Dakota.
Near Rapid City at the Wyoming border I-90 is a four-lane divided highway with a grass median. In the Sioux Falls area, I-90 intersects I-29 and continues east a short distance to Minnesota. I-90 is the longest east–west thoroughfare in South Dakota. This interstate goes through Mitchell, Sioux Falls, and Rapid City. It does not go through the state capital of Pierre.
The South Dakota section of I-90 is defined at South Dakota Codified Laws § 31-4-184.
The Minnesota section of I-90 is defined as Route 391 in Minnesota Statutes § 161.12(3).
I-90 crosses southern Minnesota from the South Dakota border near Beaver Creek, Minnesota, to the Mississippi River near La Crosse, Wisconsin. On most of its length in the state, it is close to the Iowa border and fairly parallel with it. In southeast Minnesota, it curves north to Rochester and Winona.
The wayside rest area near Blue Earth, Minnesota is where Minnesota's east-building and west-building I-90 teams linked up in 1978, thus completing the final mile of the Minnesota section and symbolically joining the 3,099.07 miles (4,987.47 km) of the Interstate. Since being overlaid with bituminous paving in 2006, the original four-foot-wide (1.2 m) gold colored cement concert line marking the completion of I-90 has been replaced with gold paint on just the shoulder portions of the roadway at the same location; plaques dedicating and describing this special segment of I-90 pavement can be found at the Blue Earth rest areas.
At the Minnesota-Wisconsin border I-90 is carried on a high bridge over the upper Mississippi River, departing La Crescent, Minnesota. The route uses French Island for part of its ford over the Mississippi. Just upstream from the bridge is Lock and Dam No. 7.
I-90 crosses Wisconsin from Minnesota to Illinois in a generally southeasterly direction. It joins I-94 in Tomah and I-39 in Portage. I-94 separates from I-90 at Madison.
I-39/90/94 from just south of Portage to Madison is the longest concurrency of three Interstate Highways in the United States.
I-90 enters Illinois north of Rockford oriented north–south joined with I-39. It then runs east-southeast directly to the city of Chicago. From Rockford to I-294 the road is tolled and called the Jane Addams Memorial Tollway. Prior to 2007 the Jane Addams Memorial Tollway was called the Northwest Tollway. In the Chicago metropolitan area, I-90 is known by three names from O'Hare International Airport to the Indiana state line. The Kennedy Expressway runs from O'Hare to I-290 and the Chicago Loop. I-90 continues running south of the Loop on part of the Dan Ryan Expressway, and then southeast onto the tolled Chicago Skyway into Indiana.
In the state of Indiana, the entirety of I-90 is concurrent with the Indiana Toll Road. I-90 enters from Illinois at the Chicago Skyway. It then runs to the concurrency of I-80/I-94 east of I-65, where I-80 leaves I-94 and joins with I-90. The combined I-80/I-90 route runs east across northern Indiana and near the southern border of Michigan to the Ohio state line. I-80/I-90 passes through the South Bend metropolitan area, passing the University of Notre Dame and the University Park Mall, intersecting with the St. Joseph Valley Parkway.
As part of the Toll Road, I-80/90 passes to the north of South Bend and Elkhart. It also passes north of Angola at I-69.
The Indiana Toll Road turns into the Ohio Turnpike as it crosses the border. I-90 follows the Ohio Turnpike until just south of Lorain, west of Cleveland, where it turns north to follow a route near the shores of Lake Erie. Originally, it was going to be parallel to, and north of, I-80/Ohio Turnpike further west to Toledo. Parts were built with an interim assignment of State Route 2 (SR 2). Later; that plan was abandoned, and the I-90/I-80 exit/connector was built instead; those existing parts retain the SR 2 designation.
In Cleveland, I-90 serves as the Innerbelt at the confluence of the northern termini of I-71 and I-77. One of the most peculiar and hazardous stretches of I-90 is the section of highway passing through downtown, known locally as Dead Man's Curve. Here, the road takes a nearly 90-degree turn.While there are plenty of large signs, flashing lights, and rumble strips alerting motorists to this turn, there have still been a large number of crashes resulting from inattentive motorists. There are plans to realign the freeway along a shallower curve within the next decade, as part of a larger project to improve the highway system in Cleveland.
The Innerbelt in Cleveland previously used a steel-gusset bridge of the same design as the I-35W bridge that failed in Minneapolis, Minnesota in 2007. Beginning September 30, 2008, two lanes in each direction of the eight-lane bridge were closed to reduce the weight load on the structure. On October 8, 2008, the bridge was closed entirely to undergo a stress test. In May and June 2009, the bridge was closed while engineers lifted it with hydraulic jacks and moved it approximately six inches to realign it. Many in the Cleveland area had begun to question the safety of the bridge, and the Ohio Department of Transportation continued to assert that the bridge was safe and if there was any imminent danger it would be permanently closed. Construction of a new crossing, the George V. Voinovich Bridges, began in 2011.
It includes two parallel bridges, one for each direction of traffic. The first bridge, carrying westbound traffic only, was built immediately north of the Innerbelt Bridge and opened in November 2013. Demolition on the Innerbelt Bridge, which closed November 23, 2013, began in January 2014. The project was finished in 2016 with the completion of the eastbound bridge, built on the site of the Innerbelt Bridge, and fully opened on October 24.
From here I-90 again joins SR 2 and runs along the Lake Erie shoreline before heading through the industrial suburbs of Cleveland. As it nears the Lake County line, I-90 separates once again from SR 2 before briefly merging with I-271, which terminates at I-90. It then continues east through the rolling countryside to the Pennsylvania state line.
In Pennsylvania, I-90 is called the "AMVETS Memorial Highway". 50 mph (80 km/h). At 46.4 miles (74.7 km), it is I-90's shortest single-state length.This non-tolled section of I-90 extends from the Ohio state line through to New York state passing south of Erie, Pennsylvania. It is also signed as such in New York. Although this was supposed to be the "Erie Extension" of the Pennsylvania Turnpike, it was actually completed in 1958 with funding from the Pennsylvania Turnpike Commission. When this portion of the highway was open, the speed limit was
I-90 runs concurrently with the New York State Thruway upon entering the state of New York. Between the Pennsylvania state line and the Syracuse interchange, it is also signed as the "AMVETS Memorial Highway". It follows the Lake Erie coast until Buffalo, where it joins the old Water Level Route until Albany. There, it takes a short detour along the Rensselaer County Veterans Memorial Highway before joining the New York State Thruway Berkshire Connector.
Almost all of the New York portion of the road is a toll road, comprising the east–west portion of the New York State Thruway mainline and part of the Berkshire Connector, operated by the New York State Thruway Authority. It was originally constructed as part of the Thruway project in the middle 1950s and received its current designation as I-90 in 1958. The road roughly follows the course of the 19th-century Erie Canal for much of its length in New York State. "I-90" (operated by NYSDOT) carries I-90 between the two; however, the Berkshire Section directly connects to the mainline at Thruway interchange 21A 6.5 miles (10.5 km) west of the point where I-90 joins it at Thruway interchange B1.
The mileposts and exit numbers on the New York State Thruway mainline originate at the New York City line and increase northward along I-87 and westward along I-90. As a result, mileposts and exit numbers on the I-90 section of the Thruway mainline increase from east to west, contrary to modern practices where numbers increase from the west or south. The NYSDOT-maintained portion in between, known to locals as "I-90," does number its mileage and exits in the traditional west-to-east method. Coincidentally, the NYSDOT maintained portion of I-90 is oriented geographically north–south for most of its length, so the exit numbers seem to increase from north to south. Exit and milepost numbering starts over again when the Berkshire Section of the Thruway begins, with exit and mile numbers preceded by the letter B (Exit B1, Exit B2, Mile B1, Mile B2, etc.)
There once were two metric-only signs on the westbound New York State Thruway around Syracuse, which is about 100 miles (160 km) from Ontario. The NYS Thruway Authority decided to test metric signage, which may have briefly included an 88 km/h (55 mph) speed limit sign, on the Thruway. There was also a sign displaying the distance to the I-81 interchange in kilometers in DeWitt. These signs are now only displayed in mile figures.
I-90 is currently the only Interstate having a complete set of nine spur routes (190, 290, 390...890, 990) within one state, in New York.I-80 in California has had all nine, but never all at the same time. In addition, I-990, a short spur route near Buffalo, New York not directly connected to I-90, is the highest number given to an Interstate.
I-790 in Utica used to have a completely direct connection with I-90 at Thruway interchange 31. Various road redesign projects over the years have eventually led to this direct connection being partially severed. Traffic exiting the Thruway must use two different surface streets to reach I-790. However, it is still possible to travel from I-790 directly onto the Thruway. I-790 has some other oddities: no exit numbers, no reassurance markers, and it runs concurrently with New York State Route 5 (NY 5) for its entire length.
The New York section of I-90 west of the Berkshire Section of the New York Thruway is defined as Interstate Route 504 in New York Highway Law § 340-a.
I-90 in Massachusetts runs concurrently with the pre-Interstate-era Massachusetts Turnpike (known locally as "the Pike" or on signs as "MassPike"), which opened on May 15, 1957, from West Stockbridge at the New York state border to Route 128 in Newton.
The first section of the Boston Extension opened in September 1964 from the original Massachusetts Turnpike eastern terminus at Route 128 to the Allston/Brighton Tolls. The entire Boston Extension opened on February 18, 1965 continuing from the Allston/Brighton Tolls to I-93 in Downtown Boston. The new extension added 12 miles (19 km) to the MassPike's original 123.
I-90 was extended again as part of the Big Dig from its terminus at I-93 to Boston's Logan International Airport and a terminus of Route 1A in January 2003 via tunnels under the Fort Point Channel and the Ted Williams Tunnel under Boston Harbor. This extended I-90 by an additional 2.3 miles (3.7 km), before finally terminating at Route 1A.
Tractors with two 48-foot (15 m) trailers, called "turnpike doubles", are permitted to travel between exit 96 (Prior to December 2020 this was numbered as exit 11) and through the New York state border.
I-90 made heavy use of existing roads. The Massachusetts Turnpike, New York State Thruway, Ohio Turnpike, Indiana Toll Road, Chicago Skyway, and the Jane Addams Memorial Tollway all predate I-90 and were used for parts of its route. This also means that substantial portions of the route are not precisely to Interstate Highway standards, but they are usually close.
The last section of I-90 to be built was between Seattle and Bellevue, Washington, which opened in stages between 1989 and 1993.
I-90 used to have one of only a few snow sheds on the Interstate Highway System, at Snoqualmie Pass. The snowshed was used to cover the westbound lanes in the event of an avalanche, and had been removed at the end of April 2014.The Washington State Department of Transportation plans to replace the snowshed with avalanche bridges as part of a $551 million plan to widen I-90 along the east end of Snoqualmie Pass.
In 1991, a section of I-90 had to be elevated to allow a bikeway to go underneath it. [ citation needed ] Since 1980, I-90 from Seattle to Thorp, Washington, comprises the Mountain to Sound Greenway trail.
I-90 in New York is the only interstate to have a complete set of auxiliary routes, all nine possible three-digit route numbers, within a single state.
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.
Interstate 95 (I-95) is the main north–south Interstate Highway on the East Coast of the United States, running from U.S. Route 1 (US 1) in Miami, Florida to the Houlton–Woodstock Border Crossing between Maine and the Canadian province of New Brunswick. The highway largely parallels the Atlantic coast and US 1, except for the portion between Savannah and Washington and the portion between Portland and Houlton, both of which follow a more direct inland route.
Interstate 80 (I-80) is an east–west transcontinental freeway in the United States that runs from downtown San Francisco, California, to Teaneck, New Jersey, in the New York City Metropolitan Area. The highway was designated in 1956 as one of the original routes of the Interstate Highway System. Its final segment was opened to traffic in 1986. It is the second-longest Interstate Highway in the United States, following I-90. The Interstate runs through many major cities including Oakland, Sacramento, Reno, Salt Lake City, Omaha, Des Moines, and Toledo, and passes within 10 miles (16 km) of Chicago, Cleveland, and New York City.
Interstate 75 (I-75) is a major north–south Interstate Highway in the Great Lakes and Southeastern regions of the United States. As with most Interstates that end in a five, it is a major cross-country, north–south route, one of the longest in the U.S., from southern Florida to the northeastern point of the Upper Peninsula of Michigan. It travels from State Road 826 and SR 924 on the Hialeah–Miami Lakes border to Sault Ste. Marie, Michigan, at the Canadian border.
Interstate 94 (I-94) is an east–west Interstate Highway connecting the Great Lakes and northern Great Plains regions of the United States. Its western terminus is in Billings, Montana, at a junction with I-90; its eastern terminus is in Port Huron, Michigan, where it meets with I-69 and crosses the Blue Water Bridge into Sarnia, Ontario, Canada, where the route becomes Ontario Highway 402. It thus lies along the primary overland route from Seattle to Toronto, and is the only east–west Interstate highway to have a direct connection to Canada. I-94 intersects with I-90 several times: at its western terminus; Tomah to Madison in Wisconsin; in Chicago, and in Lake Station, Indiana. Major cities that I-94 connects to are Billings; Bismarck; Fargo; Minneapolis–Saint Paul; Madison; Milwaukee; Chicago; and Detroit.
Interstate 79 (I-79) is an Interstate Highway in the eastern United States, designated from I-77 in Charleston, West Virginia to Pennsylvania Route 5 and PA 290 in Erie, Pennsylvania. It is a primary thoroughfare through western Pennsylvania and West Virginia, and makes up part of an important corridor to Buffalo, New York, and the border with Canada. Major metropolitan areas connected by I-79 include Charleston and Morgantown in West Virginia, and Pittsburgh, and Erie in Pennsylvania. In West Virginia, I-79 is known as the Jennings Randolph Expressway, named for Jennings Randolph. In the three most northern counties it is signed as part of the High Tech Corridor. For most of its Pennsylvania stretch, it is known as the Raymond P. Shafer Highway, named for Raymond P. Shafer.
Interstate 77 (I-77) is a north–south Interstate Highway in the eastern United States. It traverses diverse terrain, from the mountainous state of West Virginia to the rolling farmlands of North Carolina and Ohio. It largely supplants the old U.S. Route 21 between Cleveland, Ohio, and Columbia, South Carolina, as an important north–south corridor through the middle Appalachians. The southern terminus of Interstate 77 is in Columbia at the junction with Interstate 26. The northern terminus is in Cleveland at the junction with Interstate 90. Other major cities that I-77 connects to include Charlotte; Charleston, West Virginia and Akron, Ohio. The East River Mountain Tunnel, connecting Virginia and West Virginia, is one of only two instances in the United States where a mountain road tunnel crosses a state line. The other is the Cumberland Gap Tunnel, connecting Tennessee and Kentucky. I-77 is a route to the southern United States for those traveling from the Great Lakes region.
Interstate 71 (I-71) is a north–south Interstate Highway in the Great Lakes/Midwestern and Southeastern region of the United States. Its southern terminus is at an interchange with I-64 and I-65 in Louisville, Kentucky, and its northern terminus at an interchange with I-90 in Cleveland, Ohio. I-71 runs concurrently with I-75 from a point about 20 miles (32 km) south of Cincinnati, Ohio, into downtown Cincinnati. Almost three-quarters of the route lies east of I-75, thereby putting it out of its proper place in the Interstate grid. While most odd numbered Interstates are north–south, I-71 however is designated more of a northeast–southwest highway and mainly a regional route, serving Kentucky and Ohio. It links I-80 and I-90 to I-70, and ultimately links to I-40. Major metropolitan areas served by I-71 includes Louisville, Cincinnati, Columbus, and Cleveland.
New York State Route 17 (NY 17) is a major state highway that extends for 397 miles (638.91 km) through the Southern Tier and Downstate regions of New York in the United States. It begins at the Pennsylvania state line in Mina and follows the Southern Tier Expressway east through Corning to Binghamton and the Quickway from Binghamton east to Woodbury, where it turns south to follow the Orange Turnpike to the New Jersey state line near Suffern, where it connects to New Jersey Route 17. From the Pennsylvania border to the village of Waverly and from Binghamton to Windsor, NY 17 is concurrent with Interstate 86 (I-86). Eventually, the entire east–west portion of NY 17 from the Pennsylvania border to Woodbury will become I-86 as projects to upgrade the route to Interstate Highway standards are completed.
E‑ZPass is an electronic toll collection system used on most tolled roads, bridges, and tunnels in the Midwestern and Eastern United States, as far south as Florida and as far west as Illinois. The E-ZPass Interagency Group (IAG) consists of 39 member agencies in operation within 17 states, which use the same technology and allow travelers to use the same transponder on toll roads throughout the network. Since its creation in 1987, various independent systems that use the same technology have been folded into the E-ZPass system, including the I-Pass in Illinois and the NC Quick Pass in North Carolina. Negotiations are ongoing for nationwide interoperability in the United States.
Interstate 890 (I-890) is a 9.45-mile-long (15.21 km) auxiliary Interstate Highway in the vicinity of Schenectady, New York, in the United States. The highway runs southeast–northwest from an interchange with the New York State Thruway (I-90) northwest of Schenectady to another junction with the Thruway south of the city and passes through Downtown Schenectady along the way. Most of I-890 is six lanes wide, including a section that runs above an industrial section of Schenectady on an elevated highway. I-890 is a local, toll-free alternative to the Thruway, which bypasses the city and its suburbs to the southwest.
The New York State Thruway is a system of controlled-access highways spanning 569.83 miles (917.05 km) within the U.S. state of New York. It is operated by the New York State Thruway Authority (NYSTA), a New York State public-benefit corporation. The 496.00-mile (798.23 km) mainline is a toll road that extends from the New York City line at Yonkers to the Pennsylvania state line at Ripley by way of Albany, Syracuse, and Buffalo. According to the International Bridge, Tunnel and Turnpike Association, the Thruway is the fifth busiest toll road in the United States.
Interstate 790 (I-790) is an auxiliary Interstate Highway in the city of Utica, New York, in the United States. It runs for 2.29 miles (3.69 km) from an interchange with New York State Route 5A (NY 5A) and NY 5S in downtown Utica to a pair of interchanges with Genesee Street east of the city. All of I-790 is concurrent with NY 5, and the portion south of NY 49 is also concurrent with NY 8 and NY 12. I-790 connects to exit 31 of the New York State Thruway (I-90) by way of an interchange near its east end. According to the New York State Department of Transportation (NYSDOT), I-790 follows NY 5 to Genesee Street while the highway leading to Thruway exit 31 is merely a pair of ramps connecting I-790 to its parent. The north–south portion of I-790 between its western terminus and NY 49 is named the North–South Arterial Highway.
Interstate 84 (I-84) is an Interstate Highway in the northeastern United States that extends from Dunmore, Pennsylvania, at an interchange with I-81 east to Sturbridge, Massachusetts, at an interchange with the Massachusetts Turnpike (I-90). Among the major cities that the road passes through is Hartford, Connecticut. Another highway named I-84 is located in the northwestern United States.
Interstate 76 (I-76) is an east–west Interstate Highway in the Eastern United States, running about 434 miles (700 km) from an interchange with I-71 west of Akron, Ohio, east to I-295 in Bellmawr, New Jersey.
Interstate 190 is a north–south auxiliary Interstate Highway that connects I-90 in Buffalo, New York with the Canada-U.S. border near Niagara Falls. The freeway bisects downtown Buffalo before crossing Grand Island and travelling around the outskirts of Niagara Falls before crossing the Niagara River on the Queenston-Lewiston Bridge into Ontario. On the Canada side of the Canada–US border, the freeway continues as Highway 405, a short spur that connects with the Queen Elizabeth Way (QEW), which in turn provides a freeway connection to Toronto, Canada's largest city. The 28.34-mile-long (45.61 km) route also provides access to the QEW at the Peace Bridge between Buffalo and Fort Erie, Ontario.
Interstate 80 (I-80) in the U.S. state of Pennsylvania runs for 311.07 miles (500.62 km) across the northern part of the state. It is designated as the Keystone Shortway, and officially as the Z.H. Confair Memorial Highway. This route was built mainly along a completely new alignment, not paralleling any earlier U.S. Routes, as a shortcut to the tolled Pennsylvania Turnpike to the south and New York State Thruway to the north. It does not serve any major cities in Pennsylvania, and serves mainly as a cross-state route on the Ohio-New York City corridor. Most of I-80's path across the state goes through hilly and mountainous terrain, while the route passes through relatively flat areas toward the western part of the state.
Interstate 90 (I-90) runs east–west across the northern tier of the U.S. state of Ohio. Much of it is along the Ohio Turnpike, but sections outside the turnpike pass through Cleveland and northeast into Pennsylvania.
Interstate 90 (I-90) is a part of the Interstate Highway System that runs from Seattle, Washington, to Boston, Massachusetts. In the U.S. state of New York, I-90 extends 385.88 miles (621.01 km) from the Pennsylvania state line at Ripley to the Massachusetts state line at Canaan, and is the second-longest highway in the state after NY 17. Although most of the route is part of the tolled New York State Thruway, two non-tolled sections exist along I-90. Within New York, I-90 has a complete set of auxiliary Interstates, which means that there are interstates numbered I-190 through I-990 in the state, with no gaps in between. For most of its length in New York, I-90 runs parallel to the former Erie Canal route, New York State Route 5 (NY 5), U.S. Route 20 (US 20) and the CSX railroad mainline that traverses the state.
Within the U.S. state of Pennsylvania, Interstate 90 (I-90) spans 46.297 miles (74.508 km), all within Erie County, from the Ohio border near West Springfield to the New York border near North East. I-90 is the primary west–east highway in the Erie area, passing south of downtown and interchanging with Interstate 79, which connects downtown Erie to southern Pennsylvania and beyond, and Interstate 86, linking Erie to the Southern Tier of New York. U.S. Route 20, which interchanges with I-90 near the New York-Pennsylvania border, parallels I-90 across the county.
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