Our Projects

  • Address traffic congestion & safety issues along the 15-mile corridor
Our Solutions
  • Traffic data collection
  • Traffic engineering analysis
  • Traffic signal evaluation
  • Public involvement
  • Needs analysis
  • VISSIM simulation
  • Alternatives analysis

Coatesville - Downingtown Bypass Project

Mid AtlanticHighways, Streets & StructuresTraffic & Parking
PennDOT District 6-0, Chester County, PA
  • Coatesville - Downingtown Bypass Project by McMahon Associates
  • Coatesville - Downingtown Bypass Project by McMahon Associates

McMahon currently serves as a subconsultant on the Coatesville-Downingtown Bypass Reconstruction Project. The purpose of the overall project is to address traffic congestion and safety issues along the 15-mile corridor known as the Coatesville-Downingtown Bypass in Chester County, PA. This study was commissioned by PennDOT District 6-0 and performed by a consulting team, including McMahon as a major subconsultant. This study focuses on mainline and interchange alternatives to evaluate the need for mainline roadway widening, upgrading the eight interchanges, replacing mainline and overhead bridges, improving safety, and reducing delay and congestion along the corridor. McMahon is responsible for all aspects of the traffic engineering analysis and public involvements. For the traffic analysis, McMahon collected traffic counts along the corridor and at the interchanges, coordinated with DVRPC in
the development of future traffic projections for five scenarios and will be utilizing those projections in the evaluation of numerous alternatives for the mainline and interchanges along the corridor. In addition, McMahon is working on a VISSIM model for the corridor to provide 3-D simulation for the recommended alternatives. McMahon is also designing and managing a project website for the project to provide updates and project status to the public. The study’s findings, conclusions and recommendations are intended to be utilized by PennDOT, DVRPC and the Chester