Interstate 99

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Interstate 99 (I-99) is an Interstate Highway in the United States with two segments: one located in central Pennsylvania and the other in northern Pennsylvania into southern New York along US 15. The southern terminus of the route is near exit 146 of the Pennsylvania Turnpike (I-70/I-76) north of Bedford, where the road continues south as U.S. Route 220 (US 220). The northern terminus of the southern segment is at an at-grade intersection with Musser Lane near I-80 near Bellefonte. The northern segment is entirely concurrent with US 15, beginning at I-180 in Williamsport northward into New York to an interchange with I-86 in Corning. Within Pennsylvania, I-99 passes through Altoona and State College—the latter home to the Pennsylvania State University—and is almost entirely concurrent with US 220. As of 2026, a roughly 50-mile (80 km) gap in the route remains between Bellefonte and Williamsport. Long-term plans call for the two segments to be connected using portions of I-80 and US 220...

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