List of Interstate Highways in Pennsylvania

List Of Interstate Highways In Pennsylvania

State Highway System
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List of Interstate Highways in Pennsylvania

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<br>The list of Interstate Highways in Pennsylvania encompasses 23 Interstate Highways&mdash;12 primary routes and 11 auxiliary routes&mdash;which exist entirely or partially in the U.S. state of Pennsylvania. In Pennsylvania, Interstate highways are maintained by the Pennsylvania Department of Transportation (PennDOT). 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

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