Interstate 80 largely replaced its companion U.S. routes in the West and parallels them in the East. Between San Francisco and Park City, Interstate 80 replaced U.S. 40. Sections of original U.S. 40 are still in use as local county roads in California, while many segments of U.S. 40 in Nevada were directly replaced by I-80. Today, U.S. 40 begins eastward from an interchange with I-80 in Park City. Between Park City and Echo Junction, I-80 replaced U.S. 189 (and U.S. 530 before it). East from Echo Junction to Evanston and southwestern Wyoming, I-80 overlaid the historic route of U.S. 30S. U.S. 30 accompanies the cross country route east from Granger Wyoming to the Midwestern U.S.
U.S. 30 is the Lincoln Highway through Wyoming, Nebraska, Iowa, Illinois, Indiana and Ohio. It closely parallels Interstate 80 in Wyoming and Nebraska, combining with the freeway in the least populated areas (such as the cosigned portion between Granger and Walcott in Wyoming, a distance of 170 miles). Once at Grand Island, Nebraska, U.S. 30 shifts away from the freeway to the north of Lincoln and Omaha; Interstate 80 instead follows U.S. 34 between Grand Island and Lincoln and U.S. 6 from Lincoln to the Quad Cities via Omaha and Des Moines. Additionally U.S. 6 merges with I-80 several times through Iowa, and it closely parallels the freeway through Illinois before joining it again in Lansing.
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U.S. 30 and I-80 meet again at Joliet, Illinois. Having avoided Des Moines and the Quad Cities, U.S. 30 heads southeast to avoid Chicago. U.S. 30 continues on this trajectory en route to Fort Wayne, Indiana and Pittsburgh and Philadelphia, Pennsylvania; it does not intersect I-80 again. Interstate 80 instead remains close to U.S. 6 and U.S. 20 as they skirt the southern edge of the Great Lakes. I-80 is tolled through Indiana and Ohio, so the parallel U.S. 6 and U.S. 20 provide free alternate routes.
Bypassing Cleveland to the south, Interstate 80 leaves both U.S. 6 and U.S. 20, as they follow I-90. Leaving the Ohio Turnpike at North Jackson, I-80 briefly parallels U.S. 62 through Sharon. Continuing east past Youngstown, I-80 follows a path that was not previously tread by a U.S. route. This solo route continues for the most part across Pennsylvania on what was designated the Keystone Shortway, with the exception of U.S. 322 from Clarion to State College and a brief merge with U.S. 220 near State College. Finally entering New Jersey, I-80 picks up U.S. 46, a route which is almost entirely located within New Jersey — it never went any farther west than PA 611 (former U.S. 611). U.S. 46 parallels the freeway east to I-95 at Ridgefield Park.
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