Interstate 78 in Pennsylvania  Interstate 78 (I-78) is an east–west Interstate Highway stretching from Union Township in Lebanon County, Pennsylvania east to New York City. In the U.S. state of Pennsylvania, I-78 runs for about 77 miles (124 km), from the western terminus at I-81 in Union Township, Lebanon County east to the New Jersey state line near Easton, 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 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, I-178 and I-378, were also planned; I-178 was never built while I-378 became Pennsylvania Route 378 (PA 378) as it no longer connected to I-78. Improvement of the highway in Berks County is currently underway. I-78 begins at an interchange with I-81 in Union Township in Lebanon County, heading east as a four-lane freeway. In Lebanon County, I-78 is known as the 78th Division Highway. The road passes under PA 72 and turns northeast through a mix of farmland and woodland, crossing the Swatara Creek into Swatara Township. The freeway continues through agricultural areas with some trees, curving east and entering Bethel Township. I-78 passes north of the community of Fredericksburg and comes to an eastbound exit and westbound entrance with the northern terminus of PA 343. Following this, the freeway passes through more rural areas with some nearby development and reaches a westbound exit and eastbound entrance with US 22 (William Penn Highway). At this point, US 22 becomes concurrent with I-78 and the median of the freeway narrows from a grassy median to a Jersey barrier. I-78/US 22 enters Bethel Township in Berks County and heads east-northeast through agricultural areas to the south of the Blue Mountain ridge, coming to a diamond interchange with PA 645 north of the community of Frystown. The road continues through farmland with some warehouses and reaches a diamond interchange with PA 501 north of the community of Bethel. The freeway heads through a mix of farms and woods, passing to the south of Grimes Airport and coming to a right-in/right-out interchange with Court Street eastbound and Frantz Road westbound; this interchange has no access across the freeway.