Corridor Signal Timings: Why the emphasis on signal timings & coordination?

Throughout the arterial network, research has shown that congestion it is not so much caused by lack of roadway capacity (i.e. number of lanes) but rather the ability of the traffic signals to manage peak period traffic efficiently. The DelDOT TMC has developed their Integrated Transportation Management System (ITMS) to help coordinate and implement advanced signal systems, along with various types of traffic management technologies, and the coordinating human resources that make it all work.

These efforts in producing better performing traffic signalization not only benefit automobile users, but cover all modes of transportation. Bus transit, walkers and bikers are also using the same transportation network and thus there can be times where there are competing demands for traffic movement flows.

· Cost-Effectiveness: With ever shrinking resources for expansive capital improvements, signal timing/coordination has proven to be one of the most effective methods to improve the throughput of traffic without the addition of through lanes or expanding turning bays. Optimal functioning intersections can eliminate or at least delay the need for expensive new roadway construction projects.

· Reduced air pollution emissions: Reductions in CO2 emissions along with other pollutants can be improved with more efficient traffic flow.

· Reduced Driver Delay: With signals coordinated along a corridor, a driver or mass transit vehicle can reduce the number of stops, thus creating better travel times along the corridor.

· Decreased Fuel Consumption: With shorter travel times and less delay, all residents

and transit vehicles will use less fuel.