Allegheny Mountain Realignment

Traveling Construction Allegheny Mountain Realignment

Project Overview

The Pennsylvania Turnpike Commission (PTC) will construct a new stretch of mainline roadway to increase safety, reduce congestion, and allow for the free flow of traffic through Allegheny and Stonycreek Townships in Somerset County to the south of the Allegheny Tunnel.

Safety is paramount to the project. The selected alignment was chosen to achieve the following objectives for the Allegheny Mountain Realignment project:

  • Reduce the frequency and severity of accidents in the vicinity of the tunnel
  • Eliminate rerouting of vehicles carrying hazardous materials
  • Accommodate existing and future traffic volumes
  • Minimize environmental impacts

The new alignment will reduce congestion and increase access and mobility for the region.

The alternatives analysis phase of the project has been completed and the preferred alternative was selected. The preliminary design phase began in March 2024 after the Bowman Consulting Group Team was selected in 2023.  It is expected to take four years to complete the preliminary design. Please complete the Contact Information Form to be kept updated about the project.


Contact Information Request Form

Stay updated on fieldwork activities and progress regarding the Allegheny Mountain Realignment Project by sharing your contact information using this form.

Fill Out Form

Allegheny Tunnel - Transportation Improvement Project Update

Frequently Asked Questions

Where is the Allegheny Mountain Realignment Project?

What is the purpose of the project?

Why is the project needed?

What phase is the project in?

What is included in the Preliminary Design Phase?

How can I keep informed of the study’s progress?

More Project Resources

Design & Construction Details

Find out about planned design & construction activities for this project.

Learn More

News & Public Involvement

Learn how we stay connected with the public about this project.

Stay Updated

Team & Contact Information

Learn about the team that we will work with to complete the work on this project.

Contact the Team