Interstate 80
I-80 is the Interstate Highway that most closely approximates the route of the historic Lincoln Highway, the first road across the United States. 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, the first transcontinental airmail route, and except in the Great Salt Lake area, the entire route of the First Transcontinental Railroad. From near Chicago east to near Youngstown, Ohio, I-80 is a toll road, containing the majority of both the Indiana Toll Road and the Ohio Turnpike. I-80 runs concurrently with I-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.
Transportation in North America
The United States road network is the largest in the world, with 6.4 million km (4 million mi) of roadways. of those are Interstate Highways, and around another are U.S. Highways. The Interstate Highway system is almost completely composed of multi-lane, dual-carriageway freeways. The contiguous United States are also connected to its exclave, Alaska, via the Alaska Highway, which links the state to Yukon Territory, British Columbia, and the Lower 48 states. The continental United States is disconnected from the state of Hawaii and various insular areas in Oceania.