List of Interstate Highways in Pennsylvania


The list of Interstate Highways in Pennsylvania encompasses 23 Interstate Highways—12 primary routes and 11 auxiliary routes—which exist entirely or partially in the U.S. state of Pennsylvania. In Pennsylvania, most of the Interstate highways are maintained by the Pennsylvania Department of Transportation. Some stretches are also maintained by the Pennsylvania Turnpike Commission, Delaware River Port Authority, the Delaware River Joint Toll Bridge Commission, and 2 short stretches maintained by the New York State Department of Transportation. Interstate highways make up three percent of all roadway lane miles in Pennsylvania and have a combined length of within the state. Twenty-four percent of all vehicle traffic is on the Interstate system.

Primary Interstate Highways

Auxiliary Interstate Highways

Business routes

Gallery


File:I-95 SB at PA Turnpike.jpg|I-95 at I-276 exit
File:Int90eRoadPA-Exit22AB-Int79ns.jpg|I-90 at I-79 exit
File:Interstate 78 and 81 junction, northbound.jpg|I-81 at I-78 exit
File:2015-12-14 12 41 37 View north along Interstate 99 and U.S. Route 220 at Exit 73 in College Township, Pennsylvania.jpg|I-99 to I-80
File:Interstate 176 northern terminus.JPG|I-176 end at US 422
File:Pavement markings I-283 & I-83.jpg|I-83 and I-283
File:I-476 north of US 1.JPG|I-476 north of US 1
File:376 00.jpg|I-376 in Pittsburgh
File:Breezewood Exit.jpg|I-70 and I-76 at eastern split
File:I-76 WB at I-676-US 30 interchange.jpeg|I-76 approaching I-676
file:Interstate7079Washington.jpg|I-79 at I-70