U.S. Route 30

U.S. Route 30 or U.S. Highway 30 (US 30) is an east-west main route in the system of the United States Numbered Highways, with the highway traveling across the northern tier of the country. With a length of 3,073 miles (4,946 km), it is the third longest U.S. highway, after U.S. Route 20 and U.S. Route 6. The western end of the highway is at US 101 in Astoria, Oregon; the eastern end is at Virginia Avenue, Absecon Boulevard, and Adriatic Avenue in Atlantic City, New Jersey. Despite long stretches of parallel and concurrent Interstate Highways, it has not been decommissioned unlike other long haul routes such as U.S. Route 66.

In Pennsylvania, U.S. Route 30 (US 30) runs east–west across the southern part of the state, passing through Pittsburgh and Philadelphia on its way from the West Virginia state line east to the Benjamin Franklin Bridge over the Delaware River into New Jersey. Additionally, in Pennsylvania, US 30 runs along or near the transcontinental Lincoln Highway, which ran from San Francisco, California to New York City before the U.S. Routes were designated. (However, the Lincoln Highway turned northeast at Philadelphia, using present U.S. Route 1 and its former alignments to cross the Delaware River into Trenton, New Jersey.)