This article is about the section of Interstate 78 in Pennsylvania. For the entire route, see Interstate 78.
Interstate 78
I-78 highlighted in red
Route information
Maintained by PennDOT and DRJTBC
Length
77.95 mi[1] (125.45 km)
Existed
1957–present
History
Completed in 1989
NHS
Entire route
Major junctions
West end
I-81 in Union Township
Major intersections
US 22 from Bethel Township to Upper Macungie Township
PA 501 in Bethel
PA 183 near Strausstown
PA 61 near Hamburg
PA 100 in Fogelsville
PA 309 from Dorneyville to Summit Lawn
US 222 / PA 222 near Dorneyville
PA 29 near Allentown
PA 33 in Lower Saucon Township
East end
I-78 at the New Jersey state line in Williams Township
Location
Country
United States
State
Pennsylvania
Counties
Lebanon, Berks, Lehigh, Northampton
Highway system
Interstate Highway System
Main
Auxiliary
Suffixed
Business
Future
Pennsylvania State Route System
Interstate
US
State
Scenic
Legislative
← PA 77
→ PA 78
← PA 177
I-178
→ PA 178
Interstate 78 (I-78) is a major east–west Interstate Highway stretching from Union Township, Lebanon County, Pennsylvania, in the west to the Holland Tunnel and New York City in the east. In Pennsylvania, I-78 runs for about 78 miles (126 km) from the western terminus at I-81 in Union Township east to the New Jersey state line near Easton in Northampton County.
Much of I-78 west of Allentown predates the Interstate Highway System as a freeway upgrade of U.S. Route 22 (US 22), which runs concurrently with I-78 between Bethel Township and Upper Macungie Township. The Interstate, originally planned as Interstate 80N (I-80N), was supposed to continue its concurrency with US 22 to the New Jersey state line but was realigned to the south due to local opposition.
Two auxiliary routes, Interstate 178 (I-178) and I-378, were also planned as spurs into Allentown and Bethlehem respectively, but I-178 was never built and I-378 became Pennsylvania Route 378 (PA 378) since it no longer connected to I-78. Improvement of the highway in Berks County is currently underway.
^Federal Highway Administration (December 31, 2021). "Table 1 - Main Routes". FHWA Route Log and Finder List. Retrieved May 30, 2022.
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Global Information
I-81 in Union Township
I-78 at the New Jersey state line in Williams Township
