#
U.S. Department of Transportation
Environmental Benefits from Current
Systems
§Adaptive Signal
Operations
□Tucson, Arizona | Models indicated adaptive
signal control could decrease
delay for travelers on the main street by 18.5% while decreasing delay for travelers on cross-streets by 28.4%.
□Los Angeles, California | Adaptive signal control systems
improved travel time by 13%, decreased stops by 31%, and reduced delay by 21%.
□The University of Virginia | Simulation study found that
adaptive signal
control reduced delay by 18 to 20% when compared to fixed-time signal control.
□Lees Summit, Missouri | An adaptive traffic
signal system was implemented on a 2.5-mile arterial with 12 signals.
▪Emissions either increased or decreased depending on whether or not the signal favored the
direction of travel.
When traveling
in the direction favored by the signal, emissions decreased.
When traveling
in the direction not favored by the signal, emissions ranged from an increase of 9% to a decrease of 50%.