A signal re-timing project for the US city of Philadelphia’s Department of Streets has been awarded to McMahon Associates. The project aims to reduce congestion by improving the traffic flow through traffic signals optimisation along selected corridors.

McMahon will provide a comprehensive study of the existing traffic signals on 21 corridors, including over 600 intersections, and engineering services for the re-timing of these traffic signals.

The company will also conduct before and after travel time studies, traffic volume data collection, capacity analysis for re-timing of signals, and prepare work orders for the city.

The project, expected to begin in 2010 summer and finish within two years, will also be carried out by subconsultants KMJ Consulting as well as Gilmore and Associates.

Philadephia’s Traffic Engineering Unit has 2,800 signalised intersections, 15,000 conventional stop intersections, and 3,000 all-way stop intersections under its jurisdiction on a street system that covers 4,150km.