High Quality Content by WIKIPEDIA articles! Interstate 99 (I-99) is an intrastate Interstate Highway located in central Pennsylvania in the United States. The southern terminus of the route is at exit 146 of the Pennsylvania Turnpike (I-70 and I-76) north of Bedford, where the road continues south as U.S. Route 220 (US 220). The northern terminus is at I-80 near Bellefonte. I-99 passes through Altoona and State College–the latter home to Pennsylvania State University–and is entirely concurrent to US 220. Long-term plans call for I-99 to be extended southward along the US 220 corridor to an interchange with I-68 in Cumberland, Maryland, and northward along the US 220 and US 15 corridors to an interchange with I-86 west of Corning, New York.