Design & Construction Details

Milepost A53-A57 Northeast Extension  Design & Construction Details

Total Reconstruction Project


The project will also include removing and replacing five overhead bridges, including the Tilghman Street Bridge (S.R. 1002), 16459 I-78 Bridge, Hamilton Boulevard (S.R. 6222) Bridge, East Texas Road Bridge (T-471), and Lower Macungie Road Bridge (S.R. 2012). The bridges must be lengthened to accommodate the wider turnpike roadway before roadway reconstruction and widening can begin.


Work Zone Traffic Control Analysis was completed for the Pennsylvania Turnpike Commission’s (PTC) Northeast Extension (I-476) from milepost A-53 to A-57, in conformance with PennDOT’s Traffic Engineering Manual, Publication 46, March 2013 Edition. The report includes analyses to determine anticipated delays during construction with the implementation of a detour to make a determination on detours during construction.

  • Hamilton Boulevard (S.R. 6222) Bridge which crosses over the PA Turnpike at milepost 55.31, will be reconstructed, resulting in a westbound, eastbound, or full westbound/eastbound detour of traffic along Hamilton Boulevard (S.R. 6222).
  • During the replacement of the Lower Macungie Road structure, PTC will maintain one lane of traffic in each direction while the bridge is constructed off-alignment. A one-month detour of Lower Macungie Road is required to complete the tie-ins to the new alignment. Longer-term detours for the work occurring at its intersections with Millrace Road (township) and Little Spur Road (SR 2042) are required. They will be further refined and coordinated with the municipality and PennDOT District 5-0.
  • The East Texas Road Bridge, which crosses over the PA Turnpike at milepost 54.29, will be reconstructed, resulting in a detour of traffic along East Texas Road.

Staged Construction

The Tilghman Street Bridge (SR 1002) and I-78 Bridge will involve staged construction. Construction will be completed in two stages, which will allow for traffic to be shifted, not requiring a detour. During Stage One, southbound and northbound traffic will be diverted to the northbound lanes while the southbound side of the bridge is constructed. During Stage Two, northbound and southbound traffic will be redirected to the southbound lanes while the bridge's northbound side is built.

The PTC will coordinate closely with PennDOT and local municipalities as the preliminary engineering progresses. PTC's goal is to disrupt local traffic as little as possible.

MP A53 Through MP A57 Design

As design concepts and/or schedule updates become available, they will be posted here.

Current Activities

  • Tilghman Street Overhead Bridge Final Design
  • Lower Macungie Road Overhead Bridge Final Design
  • Stormwater Management Design and Coordination with Local Municipalities
  • Mainline I-476 - Preliminary Engineering Complete. Final Design currently on hold.

Project Schedule

Milepost A53 Through A57 Project Schedule

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