Interstate 99

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Interstate 99 marker

Main route of the Interstate Highway System
Main • Auxiliary • Business

Pennsylvania State Routes
Minor • Legislative

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.

Unlike most Interstate Highway numbers, which were assigned by the American Association of State Highway and Transportation Officials (AASHTO) to fit into a grid, I-99's number was written into Section 332 of the National Highway Designation Act of 1995 by Bud Shuster, then-chair of the U.S. House Committee on Transportation and Infrastructure, the bill's sponsor, and the representative of the district through which the highway runs. I-99 violates the AASHTO numbering convention associated with Interstate Highways, since it lies east of I-79 but west of I-81.

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