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Arterial Management > Enforcement > Traffic Signal Enforcement


Automated enforcement technologies can assist with the enforcement of traffic signal compliance. Still or video cameras, activated by detectors, can record vehicles traveling through a red signal.


During system testing, CV Pilot sites discover the importance of having expertise in detecting and mitigating interferences with radio frequency and GPS signals(12/13/2018)

Refine institutional arrangements when deploying connected vehicle technology to outline the expectations of partners in terms of service, outcomes and reporting.(12/13/2018)

Refine proper antenna placement on connected vehicles (particularly commercial vehicles) to reduce DSRC ‘shadow’ areas where DSRC signal is degraded.(12/13/2018)

Connected vehicle deployers are encouraged to utilize multi-vendor outsourcing and to source suppliers early to create a collaborative environment that enables as much parallel work as possible.(12/13/2018)

Connected vehicle deployers should assess field equipment and organizational capabilities that will be needed to support core CV components.(12/13/2018)

Perform robust observations at intersections before determining whether red-light cameras should be installed.(June 2018)

RSU triangulation techniques and inertial GPS solutions can improve geolocation accuracy for connected vehicles operating in dense urban environments.

Red-light camera systems can have positive impacts on driver behavior.(June 2018)

U.S. cities that turned off their red light enforcement cameras experienced 30 percent more annual red-light running fatalities per capita than would have been expected had they been left on.(March 2017)

In Chicago, red light camera enforcement systems reduced overall injury-producing intersection crashes by 10 percent.(January 2017)

Red light violation cameras significantly reduce rates of red light running at ticketed intersections and those in the same travel corridor.(January 2013)

Right angle crashes were reduced by 86 percent, total crashes by 57 percent, and estimated severity costs by $268,900 in a two year analysis of red-light traffic signal enforcement in New Jersey.(November 2012)

Intersection-related crashes decreased 11 percent overall at signal controlled intersections in Texas after the installation of automated traffic enforcement systems.(June 2011)

Red light camera enforcement programs in 14 cities in the U.S. reduced the per capita rate of fatal red light running crashes by 24 percent.(February 2011)

Red light cameras reduced the occurrence of severe right-angle and left-turn crashes while the number of rear-end crashes increased.(June 2005)

Cost-benefit analysis from 132 red-light camera treatment sites in California, Maryland and North Carolina showed a positive crash reduction benefit of approximately $39,000 per site per year when property-damage-only (PDO) crashes are included and $50,000 per site per year when PDO crashes are excluded.(April 2005)

Seventy (70) percent of survey respondents in Great Britain thought that automated speed and red-light enforcement cameras were a useful way to reduce accidents and save lives. ( 11 February 2003)

Automated speed and red-light enforcement reduced the percentage of vehicles exceeding the speed limit by 58 percent, the number of persons killed or seriously injured by 4 to 65 percent, and the personal injury accident rate by 6 percent.( 11 February 2003)

In the United States, approximately 60 to 80 percent of survey respondents approve of automated enforcement systems at traffic signals. (13 August 2001)

Automated enforcement at intersections in the United States reduced traffic signal violations by 20 to 87 percent.(13 August 2001)

Automated red light enforcement at 11 intersections in Oxnard, California reduced crashes by 7 percent, decreased right-angle crashes by 32 percent, lowered injury crashes by 29 percent, and reduced right-angle injury crashes by 68 percent.(7-11 January 2001)

Automated speed and red light enforcement lowered crash frequency by 14 percent, decreased crash injuries by 19 to 98 percent, and fatalities 7 to 83 percent.(2001)

A survey conducted in 10 U.S. cities indicated that 76 to 80 percent of drivers strongly favor automated red light enforcement systems.(6-10 August 2000)

An automated enforcement system in Charlotte, North Carolina reduced red light violations by 75 percent and decreased associated crashes by 9 percent. (May/June 2000)

Automated red light enforcement has reduced the crash rate by 35 percent. (16 March 2000)

Automated red light enforcement systems have reduced right-angle crashes by 32 percent in Victoria, Australia; and decreased crash frequency by 47 percent and red light violations by 53 percent in Howard County, Maryland.(January/February 2000)

Automated red light enforcement reduced the number of violations by 42 percent at 5 intersections in San Francisco, California. (March 1999)

Automated enforcement systems have reduced red-light violations by 20 to 60 percent and crashes by 22 to 51 percent. (June 1998)

Automated enforcement systems reduced red light violations by 20 to 60 percent, decreased right-angle crashes by 30 percent, and reduced crash injuries by 10 percent.(August 1997)

Automated enforcement systems have reduced red light violations by 50 to 60 percent at two intersections in Fort Mead, Florida and Jackson, Mississippi.(17 March 1995)