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This benefit was Benefit of the Month for October, 2007! In Oakland County, Michigan a two-phase project to retime 640 traffic signals resulted in a benefit-cost ratio of 175:1 for the first phase and 55:1 for the second.
November/December 2004 Summary Information Researchers at Oak Ridge National Laboratory estimate that poor signal timing causes 296 million vehicle hours of delay. Appropriate timing of traffic signals can decrease congestion, improve air quality, reduce fuel consumption, and minimize aggressive driving behavior. Optimizing signal timing produces average benefit-to-cost ratios that approach 40 to 1. Across the nation, traffic signal retiming programs have resulted in travel time and delay reductions of 5 to 20 percent and fuel savings of 10 to 15 percent.
The benefits of improved signal timing have been demonstrated in Oakland County, Michigan and Syracuse, New York. In Oakland County, Michigan, retiming 640 traffic signals during a two-phase project resulted in Carbon monoxide reductions of 1.7 and 2.5 percent, Nitrogen oxide reductions of 1.9 and 3.5 percent, and hydrocarbon reductions of 2.7 and 4.2 percent. The benefit-to-cost ratios for the two phases of this project were 55:1 to 175:1. NotesSee also: Syracuse Signal Interconnect Project: Before and After Analysis Final Report. Prepared by DMJM Harris for the New York State Department of Transportation. September 2003.Goal AreasTypical Deployment LocationsMetropolitan Areas Keywordscoordinated signals, signal coordination, centralized signal control, signal synchronization, traffic signals, advanced signal control, signal timing optimization, coordinated signal control, advanced signal controller, traffic signal retiming, retiming
ID: 2007-00313
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