Twelve Year Program

The STC is responsible for reviewing and approving Pennsylvania’s Twelve Year Program (TYP), which is the Commonwealth’s official transportation program. The TYP is a multimodal, fiscally-constrained program of transportation improvements spanning a 12-year period. Multimodal means that the TYP includes all travel modes, including highways, bridges, public transit, aviation, rail, and bicycle and pedestrian. PA State Law, Act 120 of 1970, as amended, requires PennDOT to prepare, update and submit Pennsylvania’s TYP every two years to the STC. It is then sent to the Governor, the General Assembly and the Secretary of Transportation.

Link to TYP Report

Learn more about the 2017 TYP

The TYP includes all modes of transportation
with major investments in aviation and rail. The TYP
includes aviation projects to improve safety, operations,
and upgrade facilities. Review the
current aviation projects.


In addition to aviation investments, the TYP incorporates
rail freight projects through the Rail Transportation
Assistance Program (RTAP) and the Rail Freight
Assistance Program (RFAP). Review the current rail projects.