|Length:||2,899.54 mi (4,666.36 km)|
|Existed:||1956 – present|
|West end:||US 101 in San Francisco, California|
| I-5 in Sacramento, California
I-15 in Salt Lake City, Utah
I-25 in Cheyenne, Wyoming
I-35 near Des Moines, Iowa
I-55 near Joliet, Illinois
I-65 in Gary, Indiana
I-90 near Gary, Indiana
I-75 near Toledo, Ohio
I-90 near Cleveland, Ohio
I-81 in Hazleton, Pennsylvania
|East end:||I-95 / NJ Turnpike in Teaneck, New Jersey|
Interstate 80 (I-80) is a transcontinental limited-access highway that runs from downtown San Francisco, California to Teaneck, New Jersey in the New York City Metropolitan Area. The second-longest Interstate Highway in the United States (after Interstate 90), I-80 is the Interstate Highway that most closely approximates the route of the historic Lincoln Highway, the first road across America. The highway roughly traces other historically significant travel routes in the Western United States: the Oregon Trail across Wyoming and Nebraska, the California Trail across most of Nevada and California, and, except in the Great Salt Lake area, the entire route of the First Transcontinental Railroad.
From near Chicago, Illinois east to near Youngstown, Ohio, Interstate 80 is a toll road, containing the majority of both the Indiana Toll Road and the Ohio Turnpike. I-80 runs concurrent with Interstate 90 from near Portage, Indiana to Elyria, Ohio. In Pennsylvania, I-80 is known as the Keystone Shortway, a non-tolled freeway that crosses rural north-central portions of the state on the way to New Jersey and New York City.
Route description 
Interstate 80 begins at an interchange with U.S. Route 101 in San Francisco, and then crosses the San Francisco-Oakland Bay Bridge into Oakland. It then heads northeast through Vallejo, Sacramento, and the Sierra Nevada mountains before crossing into Nevada.
In Nevada, I-80 traverses the northern portion of the state. The freeway serves the Reno–Sparks metropolitan area, and it also goes through the towns of Fernley, Lovelock, Winnemucca, Battle Mountain, Elko, Wells and West Wendover on its way through the state.
The Nevada portion of I-80 follows the paths of the Truckee and Humboldt Rivers, which have been used as a transportation corridor since the California Gold Rush of the 1840s. The interstate also follows the historical routes of the California Trail, First Transcontinental Railroad, and Feather River Route throughout portions of the state. I-80 in Nevada closely follows, and at many points directly overlaps, the original route of the Victory Highway, State Route 1 and U.S. Route 40.
After crossing Utah's western border in Wendover, I-80 crosses the desolate Bonneville Salt Flats west of the Great Salt Lake. The longest stretch between exits on an Interstate Highway is located between Wendover and Knolls, with 37 miles (60 km) between those exits. This portion of I-80, crossing the Great Salt Lake Desert, is extremely flat and straight, dotted with large warning signs about driver fatigue and drowsiness.
East of the salt flats, I-80 passes the southern edge of Great Salt Lake and continues on through Salt Lake City, where it merges with I-15 for 3 miles (4.8 km) before entering the Wasatch Mountains east of the city. It ascends Parley's Canyon and passes within a few miles of Park City as it follows a route through the mountains towards the junction with the eastern terminus of the western section of I-84. From the junction it continues up Echo Canyon and on towards the border with Wyoming, near Evanston.
The route of the Utah section of I-80 is defined in Utah Code Annotated § 72-4-113(10).
In Wyoming, I-80 reaches its maximum elevation of 8,640 feet (2,633 m) above sea level between Cheyenne and Laramie, Wyoming. Also along this stretch is Buford, Wyoming which at 8,000 feet is the highest community on I-80. Farther west in Wyoming, the interstate passes through the dry Red Desert and over the Continental Divide. In a way, the highway crosses the Divide twice, since two ridges of the Rocky Mountains split in Wyoming, forming the Great Divide Basin, from which surface water cannot drain, but can only evaporate.
I-80 enters Nebraska west of Bushnell. The western portion of I-80 in Nebraska runs very close to the state of Colorado, without entering the state; the intersection of Interstate 76 and I-80 is visible from the Colorado-Nebraska state line. From its intersection with I-76 to Grand Island, I-80 lies in the valley of the South Platte and Platte Rivers. The longest straight stretch of interstate anywhere in the system is the approximately 72 miles (116 km) of I-80 occurring between Exit 318 in the Grand Island area and milemarker 390 near Lincoln. Along this length, the road does not vary from an ideally straight line by more than a few yards. After Lincoln, I-80 turns northeast towards Omaha. It then crosses the Missouri River in Omaha to go into Iowa. It is the only interstate highway to cross the state from one end to the other.
Part of Interstate 80 in Nebraska is marked as a Blue Star Memorial Highway.
In Iowa, Interstate 80 runs from the I-80 bridge over the Missouri River where it intersects with I-29 and runs east to the Quad Cities and the Fred Schwengel Memorial Bridge over the Mississippi River. In Des Moines it merges with Interstate 35 for 15 miles (24 km). It is the main east–west arterial freeway through south-central Iowa, and the main east–west Interstate in the state.
In Illinois, I-80 runs from the Fred Schwengel Memorial Bridge across the Mississippi River south to an intersection with I-74. It then runs east across north-central Illinois just north of the Illinois River to Joliet. I-80 continues east and joins I-94 just before entering Indiana.
In Indiana, I-80 runs concurrent with another Interstate Highway for its entire length. It runs with I-94 on the Borman Expressway before joining I-90 to Ohio on the Indiana Toll Road.
The portion of I-80 between Lake Station, Indiana and Elyria, Ohio runs (with I-90) within 10 miles (16 km) of the Michigan state line. From the State Route 9 and I-80/I-90 intersection, the sign marking the Indiana-Michigan state line is visible. I-80/I-90 passes through the South Bend metropolitan area intersecting with the St. Joseph Valley Freeway. At another point in northern Indiana, I-80/I-90 comes within about 200 yards (180 m) from the Michigan border.
In Ohio, I-80 enters with I-90 from the Indiana Toll Road and immediately becomes the "James W. Shocknessy Ohio Turnpike", more commonly referred to as simply the Ohio Turnpike. The two Interstates cross rural northwest Ohio and run just south of the metropolitan area of Toledo. In Rossford, Ohio the turnpike intersects with Interstate 75 in an area known as the Crossroads of America. This intersection is one of the largest intersections of two Interstate Highways in the United States.
In Elyria Township, just west of Cleveland, I-90 splits from I-80 (leaving the turnpike and running northeast as a freeway). I-80 runs east-southeast through the southern suburbs of Cleveland and retains the Ohio Turnpike designation. Just northwest of Youngstown, the Ohio Turnpike continues southeast onto Interstate 76, while I-80 exits the turnpike and runs east to the north of Youngstown, entering Pennsylvania south of Sharon, Pennsylvania.
In Pennsylvania, I-80 is the main east–west Interstate-standard highway through central Pennsylvania. It runs from the Ohio state line near Sharon to the Delaware Water Gap Toll Bridge over the Delaware River and is called the "Confair Memorial Highway".
I-80 serves no metropolitan areas with populations greater than 100,000 in Pennsylvania directly, though it traverses the extreme northern section of the Pittsburgh metropolitan area. A spur from I-80 (I-180) runs to Williamsport, while another (I-380) runs to Scranton. I-80 intersects I-476 in the Pocono Mountains which connects with Scranton, Wilkes-Barre, Allentown and Philadelphia. I-80 intersects I-79 in Western Pennsylvania which connects with Erie (about 75 miles (121 km) to the north) and Pittsburgh (about 55 miles (89 km) to the south). Additional intersections include I-81 connecting Syracuse, NY and Harrisburg while I-99 connects with State College and Altoona. Also in Western Pennsylvania I-80 serves as the northern terminus for I-376 which connects it to the Pittsburgh International Airport and on to downtown and suburban Pittsburgh.
In Clearfield County, Interstate 80 reaches its highest elevation east of the Mississippi River, 2,250 feet (690 m), although other interstate highways east of the Mississippi, including I-26 in North Carolina and Tennessee, reach higher elevations.
In 2007, the Pennsylvania Turnpike Commission, combined with state legislature Act No. 44, initiated plans to enact a tolling system on the entire span of I-80 throughout the Commonwealth of Pennsylvania. On October 15, 2007, PennDOT and the Pennsylvania Turnpike Commission signed a 50-year lease agreement, which will allow the Commission to maintain and, eventually, toll I-80. However, such a toll has not been accepted by the Federal Highway Administration.
New Jersey 
I-80 does not enter New York City. Once the NJ Turnpike/I-95 was extended in 1971 from its former terminus at US-46 in Ridgefield, NJ to I-80 in Teaneck the section from Teaneck to Fort Lee was resigned as I-95, and it is the latter roadway that enters New York City via the George Washington Bridge. I-80's designated end (as per signage and NJDOT documents) is 4 miles (6.4 km) short of New York City in Teaneck, New Jersey, before the Degraw Ave overpass. There, signs designate the end of I-80 and the beginning of I-95.
Therefore the fact that mileage markers beyond the end of I-80 appear to follow as if they were part of I-80 is a coincidence. They match what would have been the correct mileage markers of I-95 had the Somerset Freeway been built.
Auxiliary routes 
Major intersections 
- U.S. Route 101 in San Francisco, California
- Interstate 5 in Sacramento, California
- Interstate 15 in Salt Lake City, Utah
- Interstate 84 near Echo, Utah
- Interstate 25 in Cheyenne, Wyoming
- Interstate 29 near Omaha, Nebraska
- Interstate 35 near Des Moines, Iowa
- Interstate 74 near Davenport, Iowa
- Interstate 39 near La Salle, Illinois
- Interstate 55 near Joliet, Illinois
- Interstate 57 near Chicago, Illinois
- Interstate 94 near Chicago, Illinois
- Interstate 65 in Gary, Indiana
- Interstate 90 near Gary, Indiana
- Interstate 69 near Fremont, Indiana
- Interstate 75 near Toledo, Ohio
- Interstate 90 near Cleveland, Ohio
- Interstate 71 near Strongsville, Ohio
- Interstate 77 near Richfield, Ohio
- Interstate 76 near Youngstown, Ohio
- Interstate 79 near Grove City, Pennsylvania
- Interstate 99 near Bellefonte, Pennsylvania
- Interstate 81 in Hazleton, Pennsylvania
- Interstate 95 / New Jersey Turnpike in Teaneck, New Jersey
See also 
- Federal Highway Administration Route Log and Finder List, Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of October 31, 2002
- New Jersey Department of Transportation, 2005 Straight Line Diagrams - I-80 (PDF)
- "Utah State Legislature". Le.utah.gov. Retrieved 2013-01-29.
- Nussbaum, Paul (October 17, 2007). "I-80 toll plans moving forward". The Philadelphia Inquirer.[dead link]
- Federal Highway Administration press release, September 11, 2008[dead link]
- The Roads of Metro New York — Interstate 80 (New Jersey)
- Measured in Google Earth from I-80 end sign (visible in Street View) to the beginning of the George Washington Bridge
|Wikimedia Commons has media related to: Interstate 80|
- Geographic data related to Interstate 80 at OpenStreetMap
- Route 80 overlaid on Google Maps
- Eric Buchanan's Interstate 80 Photos Index page
- Illinois Highway Ends: I-80
- Indiana Highway Ends: I-80