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Interstate 80 follows a narrow gap along the Long Run in Centre County, Penna.

Eventually the western portion of the Susquehanna Beltway and US 15 north of Williamsport will be designated Interstate 99, as all of US 15 through Corning, NY has been twinned and made-grade seperated to Interstate standards, but there are still significant gaps of at-grade four-lane road around Jersey Shore and the interchange between section of US 220 south of Lock Haven and Interstate 80 is not yet started. Notice that tight "U"-turn flyover that makes the connection to US 15 due to the location of the river, the Lycomming Creek and other topological constraints to the interchange.