Benefit

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


November/December 2004
Oakland County; Michigan; United States


Summary Information

This journal article examined how appropriate timing of traffic signals can decrease congestion, improve air quality, and reduce fuel consumption. Example retiming programs in Syracuse, New York and Oakland County, Michigan were highlighted.

FINDINGS

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.

    Notes

    See 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.

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Source

Red Light, Green Light

Author: Halkias, John and Michael Schauer

Published By: Public Roads Journal, U.S. DOT

Source Date: November/December 2004

URL: http://www.fhwa.dot.gov/publications/publicroads/04nov/07.cfm

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Notes

Benefit of the Month for March, 2010 !


Typical Deployment Locations

Metropolitan Areas

Keywords

coordinated 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

Benefit ID: 2007-00426