Milepost 320-324 Reconstruction - Overview

This section of the PA Turnpike is more than 60 years old and requires full reconstruction to meet modern interstate design and safety standards. Widening to six lanes will improve traffic flow, accommodate future traffic growth, and enhance safety for motorists.

This project involves the widening and reconstruction of approximately four miles of the Pennsylvania Turnpike between the Route 29 Interchange (Milepost 320) and the Valley Forge Service Plaza (Milepost 324) in Tredyffrin Township, Chester County. The roadway will be expanded from four lanes to six lanes, providing three 12-foot travel lanes in each direction, a 26-foot median, and 12-foot outside shoulders. The work also includes replacing four mainline bridges, lengthening culverts, constructing sound barriers, and installing stormwater management and drainage improvements.

The PA Turnpike is coordinating with Tredyffrin Township and various state, federal, and local agencies to minimize environmental impacts. This includes working with conservation organizations and environmental departments to address watershed concerns and comply with environmental regulations.

The Pennsylvania Turnpike Commission divided the original six-mile project into two phases due to funding and scheduling constraints. The Milepost 324-326 section started construction in fall 2021 and was completed in spring 2025. The Milepost 320–324 section is currently in the advertising stage. It will be bid for construction on October 29, 2025. Construction is anticipated to start in early 2026.

The cost estimate for this project is approximately $345 million. The project is anticipated to take five years to construct.