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.
Oakland County, Michigan Traffic Signal Retiming
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.
- In Syracuse, New York, benefits were realized when signal timing was optimized for 145 intersections. Signal retiming decreased the number of stops by 15.7 percent, reduced travel time by 16.7 percent, lowered delay by 18.8 percent, caused a 13.8 percent decline in fuel consumption, and resulted in a 13 percent reduction in vehicle emissions and noise pollution.
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.
Author: Halkias, John and Michael Schauer
Published By: Public Roads Journal, U.S. DOT
Source Date: November/December 2004URL: http://www.fhwa.dot.gov/publications/publicroads/04nov/07.cfm
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