McMahon was retained by the PennDOT District 6-0 to provide preliminary and final design services for three corridors within the City of Philadelphia. The Allegheny Avenue, Erie Avenue, and Olney Avenue corridors were identified for safety improvements through Road Safety Audits conducted by the Delaware Valley Regional Planning Commission. The Road Safety Audits identified several safety improvements for each corridor including modernization of traffic signals, countdown pedestrian signal heads, ADA curb ramp upgrades, improve pedestrian crossing pavement markings, improved lighting, transit interaction improvements, traffic calming, drainage improvements, access management, and intersection realignment. The improvements included upgrades at 50 signalized intersections. McMahon provided services to implement the recommended improvements from the Road Safety Audits including topographic survey, traffic counts, utility and railroad coordination, and preliminary roadway design in order to obtain safety review and design field view approval. Additional plans prepared by McMahon include roadway lighting, signing and pavement marking, right-of-way acquisition, traffic control, traffic signal, and erosion and sedimentation control. McMahon also coordinated with all project stakeholders including PennDOT, the City of Philadelphia, Philadelphia City Council, Philadelphia Water Department, and neighborhood groups.