Back Interestatal 99 Spanish Interstate 99 Basque بزرگراه میانایالتی ۹۹ Persian Interstate 99 French 주간고속도로 제99호선 Korean Interstatal 99 LMO Interstate 99 Dutch Interstate 99 Portuguese I-99 Russian Interstate 99 SIMPLE
Interstate 99 | |||||||
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 I-99 highlighted in red and Future I-99 in blue | |||||||
| Route information | |||||||
| Length | 98.34 mi[1] (158.26 km) | ||||||
| Existed | 1998[2]–present | ||||||
| NHS | Entire route | ||||||
| Pennsylvania | |||||||
| Length | 85.74 mi[1] (137.99 km) | ||||||
| South end |
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| Major intersections |
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| North end |   US 220 / PA 26 in Bellefonte | ||||||
| New York | |||||||
| Length | 12.60 mi[1] (20.28 km) | ||||||
| South end |  US 15 at the Pennsylvania state line in Lindley | ||||||
| Major intersections | |||||||
| North end |     I-86 / NY 17 / NY 352 / NY 415 near Painted Post | ||||||
| Location | |||||||
| Country | United States | ||||||
| States | Pennsylvania, New York | ||||||
| Counties | PA: Bedford, Blair, Centre NY: Steuben | ||||||
| Highway system | |||||||
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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 southern New York.[3] 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 Pennsylvania segment is at an at-grade intersection with Musser Lane just before reaching I-80 near Bellefonte. The New York segment follows US 15 from the Pennsylvania–New York border 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 entirely concurrent with US 220. Long-term plans call for the two segments of I-99 to be connected using portions of I-80, US 220, and US 15 through Pennsylvania.
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 System Designation Act of 1995 by Bud Shuster, then-chair of the US 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, as it should lie to the east of I-97 but instead lies east of I-79 and west of I-81.
- ^ a b c Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 21, 2023.
- ^ Cite error: The named reference
aashtowas invoked but never defined (see the help page). - ^ [Staff writer] (June 28, 2014). "Corning Area Now Has 2 Interstates: US 15 Designated I-99 to Pa. Border". Star-Gazette. Archived from the original on July 15, 2014. Retrieved June 28, 2014.