page_title: Interstate 78
section_title: Pennsylvania
hierarchical_section_title: Interstate 78 / Route description / Pennsylvania
context_page_description: Interstate 78 is an Interstate Highway in the Northeast United States, running 144 miles from I-81 northeast of Harrisburg, Pennsylvania, through Allentown, Pennsylvania, and western and northern New Jersey to the Holland Tunnel and Lower Manhattan in New York City.
  I-78 is a major road linking ports in the New York City and New Jersey area to points west, and sees over 4 million trucks annually, with trucks representing 24% of all traffic. It also is a major connection point toward airports in the New York area, including Newark Airport, John F. Kennedy Airport, and LaGuardia Airport. I-78 serves as a major connecting route from New York City to New Jersey via the Holland Tunnel.
context_section_description: I-78 begins at a directional-T interchange with I-81 in Union Township, Lebanon County, Pennsylvania, about 25 miles (40 km) northeast of Harrisburg. Near the east end of the county, at exit 8, U.S. Route 22 (US 22) merges with I-78, running concurrently for the next 43 miles (69 km) through Berks and Lehigh Counties.
  At exit 51, in Upper Macungie Township, US 22 leaves the highway. Drivers on I-78 eastbound must use this exit to access I-476 (Northeast Extension of the Pennsylvania Turnpike), and westbound travelers must use exit 53 (northbound Pennsylvania Route 309 (PA 309)) and then westbound US 22. From exits 53 to 60, I-78 runs concurrently with PA 309. The six-lane overlap bypasses the city of Allentown to the south and crosses South Mountain.
  At exit 60 (A-B going westbound), PA 309 south leaves for Quakertown. 6 miles (9.7 km) east, there is an interchange between PA 412 and I-78 in Hellertown, serving Bethlehem and Lehigh University. At exit 71, PA 33 reaches its southern terminus at a trumpet interchange. PA 33 traverses the Pocono Mountains and goes to Bangor and I-80. The final exit on I-78 in Pennsylvania is for Morgan Hill Road, providing access to PA 611 and Easton. I-78 then crosses the Interstate 78 Toll Bridge and enters New Jersey.
caption: Approaching the I-78 interchange on I-81 north in Union Township, Lebanon County, Pennsylvania
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