Interstate 78

Interstate 78 travels 75 miles east from I-81 in Lebanon County to Allentown, Bethlehem and Easton as part of a 143 mile route joining the Harrisburg area with Newark, New Jersey and New York City. I-78 replaced four lane sections of U.S. 22, including the Lehigh Valley Thruway through Allentown-Bethlehem for a period of time. U.S. 22 remains overlapped with the freeway from Hamlin (Exit 8) east to Chapman (Exit 51).

Interstate 78 Pennsylvania Guides

East - Lebanon / Berks Counties - 40 photos

East - Lehigh / Northampton Counties - 52 photos

West - Northampton / Lehigh Counties - 57 photos

West - Berks / Lebanon Counties - 10 photos

A new alignment for Interstate 78 south of the Allentown-Bethlehem area was proposed by the early 1980s. When it opened on November 21, 1989,¹ I-78 was fully complete in the Keystone State. The realignment of the freeway mainline away from the Lehigh Valley Thruway (U.S. 22) disconnected Interstate 378, a freeway spur into Downtown Bethlehem, from I-78 with it subsequently redesignated as Pennsylvania Route 378.

scenes

PA 412 (Main Street) heads north from the borough of Hellertown to a folded diamond interchange (Exit 67) with Interstate 78 along the Bethlehem city line. PA 412 advances north along Hellertown Road to Northampton Heights and E 4th Street.

04/23/04

Morgan Hill Road (SR 2005) north meets Interstate 78 at the easternmost interchange in Pennsylvania opposite Philadelphia Road into the city of Easton.

09/01/05

References:

1. Pennsylvania Highways: Interstate 78.

Connect with:

Interstate 81

Interstate 476

U.S. 22

U.S. 222

Route 61

Route 309

Route 611

Page Updated Tuesday January 19, 2021.