I78

I78 is a United States Interstate Highway that runs east–west across the northeastern part of the country. It stretches approximately 148 miles (238 kilometers) from the New York City area to the Pennsylvania state line near the town of Ithaca. The route serves as a major corridor connecting the New York metropolitan region with the eastern part of Pennsylvania, providing access to important cities such as Buffalo, New York and Corning, New York, before terminating near the city of Harrisburg, Pennsylvania.

The highway was first designated in 1952 as part of the original Interstate system, and it was formally completed in its current form by 1972. The I78 corridor traverses diverse geography, including the mountainous ridges of the Appalachian region, dense forested areas, and urban centers. Along its length it intersects with several major interstates and U.S. routes, including I-87, I-90 and I-81, as well as U.S. 15 and U.S. 6. The route places significant emphasis on efficient freight transport, connecting with key rail yards and port facilities in the region.

I78 is maintained by the New York State Department of Transportation and the Pennsylvania Department of Transportation. Management responsibilities include routine maintenance, such as repaving, bridge inspection, and roadway safety improvements. Rest stops, service plazas, and scenic viewpoints are strategically located to serve an estimated millions of motorists and commercial vehicles annually, playing a crucial role in the economic connectivity between the two states.