I-78 East - Allentown - Bethlehem - Lehigh Valley - Pennsylvania - 4K Highway Drive

I-78 Eastbound through the Lehigh Valley area of Pennsylvania.
Filmed: September 2022

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From Wikipedia:
I-78/US 22 enters Weisenberg Township in Lehigh County where the freeway becomes the Walter J. Dealtrey Memorial Highway[7] and continues east through farms and woods in the Lehigh Valley, passing north of the community of New Smithville. The road passes south of warehouses and comes to a diamond interchange with PA 863. Following this interchange, the freeway heads to the south of more warehouses and runs through more rural areas with some homes, crossing into Upper Macungie Township. I-78/US 22 runs between farm fields to the north and warehouses and industrial development to the south before it comes to a cloverleaf interchange with PA 100 in a business area in the community of Fogelsville. After the PA 100 interchange, the freeway widens to six lanes and heads east through industrial areas, coming to a bridge over Norfolk Southern Railway's C&F Secondary railroad line before curving northeast. In the community of Kuhnsville, US 22 splits from I-78 at an eastbound exit and westbound entrance by heading northeast on a freeway called the Lehigh Valley Thruway. From here, I-78 continues east-southeast as a four-lane freeway, passing residential subdivisions with some commercial development. The freeway continues southeast and passes over I-476 (Pennsylvania Turnpike Northeast Extension) before it comes to a westbound exit and eastbound entrance with the PA 309 freeway.

At this point, PA 309 becomes concurrent with I-78 and the freeway enters Lower Macungie Township, widening to six lanes and running past commercial development to the southwest of the Dorney Park & Wildwater Kingdom amusement park. The freeway reaches a partial cloverleaf interchange with the northern terminus of US 222 and the southern terminus of PA 222 at Hamilton Boulevard, which provides access to the cities of Allentown and Reading. Following this interchange, the road crosses into South Whitehall Township and heads east between residential areas to the north and farm fields to the south, before entering Salisbury Township and passing north of Lehigh Valley Hospital–Cedar Crest. Past the hospital, I-78/PA 309 comes to a partial cloverleaf interchange with the northern terminus of the southern section of PA 29 at Cedar Crest Boulevard before running between residential areas to the north and office buildings to the south. The freeway enters the city of Allentown and runs through woodland, crossing Little Lehigh Creek before it passes through a small section of Salisbury Township. The road heads back into Allentown and runs near residential areas, passing south of Allentown Queen City Municipal Airport before it comes to a partial cloverleaf interchange at Lehigh Street. I-78/PA 309 runs near industrial areas and passes over Norfolk Southern Railway's Reading Line before coming to a westbound exit ramp serving Emaus Avenue. The freeway passes near neighborhoods before it leaves Allentown for Salisbury Township, where it ascends forested South Mountain. The highway comes to an eastbound exit and westbound entrance with Rock Road that provides a connection to PA 145 in the community of Summit Lawn, at which point it crosses into Upper Saucon Township. Following this, the freeway turns southeast and comes to an interchange with the southern terminus of PA 145 in the community of Lanark, at which point PA 309 splits from I-78 by heading southeast on a surface road toward the borough of Quakertown. From here, I-78 turns northeast, narrowing to four lanes with the median changing from a Jersey barrier to a grassy median. The road heads between South Mountain to the northwest and a mix of farm fields, woods, and development to the southeast.

Time Stamps:
Lehigh County: 0:00
Northampton County: 11:33
Warren County, NJ: 30:18