Main Page | See live article | Alphabetical index

Interstate 99

Interstate 99 is a part of the US Interstate highway system. It is an intrastate only road in Pennsylvania. Its southern terminus is at Wolfsburg, Pennsylvania at Interstate 76 (the Pennsylvania Turnpike) and its northern terminus (as of 2002) is at Bald Eagle, Pennsylvania at United States Highway 220. Eventually, the Pennyslvania and New York transportation departments plan to extend the interstate to Painted Post, New York at Interstate 86.

Table of contents
1 Number of miles
2 Major cities along the route
3 Intersections with other Interstates
4 Spur routes
5 Notes

Number of miles


Pennsylvania - 58 miles

Major cities along the route

Intersections with other Interstates

Spur routes



Located east of Interstate 79 and west of Interstate 81, Interstate 99 is the bane of many road enthusiasts who treasure an orderly and sequential numbering system for Interstate highways. Interstate 99 is also known as the Appalachian Thruway and the Bud Shuster Byway, and it is the first Interstate highway to have its designation written into law (by Congressman Bud Shuster in the National Highway Designation Act of 1995). Several other Interstates (including future Interstate 66 in Kentucky and Interstate 86 in New York) have since had their designations written into law.

The number 99 violates the standard numbering convention associated with Interstate highways. According to numbering guidelines, the lowest odd numbers are on the West Coast and the highest numbers are on the East Coast. Several north-south routes, including Interstates 81, 83, 87, 89, 91, 93, 95, and 97, all lie east of Interstate 99.

Interstate 99 is planned to intersect Interstate 80 near State College, Pennsylvania.