City-Wide Traffic Signal Timing Optimization I & II
Washington, D.C.


  • Signal Timing Optimization
  • Synchro & Sim Traffic Modeling
  • Public involvement
  • Special Event & incedent Management
  • GIS
  • Bicycle Analysis


SAI, a Mead and Hunt Company, has led two consecutive contracts for the optimization of all 1,650 traffic signals in DC. Before & After studies have shown substantial benefits to vehicular and transit traffic, pedestrians, and bicyclists, exceeding the goal to make DC traffic signals safer and friendlier for pedestrians, improve bus running times, improve overall traffic flow, and reduce emissions. Vehicle delays have been reduced by 20%; harmful emissions by 13%, transit riders are collectively saving 2,000 hours per day, and pedestrian mobility has improved. The Benefit analyses show benefits > $150M per year.

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