title: Effects of red light camera enforcement on red light violations in Arlington County, Virginia.
abstract: OBJECTIVE
  In June 2010, Arlington County, Virginia, installed red light cameras at four heavily traveled signalized intersections. Effects of camera enforcement on red light violations were examined.
  
  
  METHODS
  Traffic was videotaped during the 1-month warning period and 1month and 1year after ticketing began at the four camera intersections, four non-camera "spillover" intersections in Arlington County (two on travel corridors with camera intersections, two on different corridors), and four non-camera "control" intersections in adjacent Fairfax County. Logistic regression models estimated changes in the likelihood of violations at camera and spillover intersections, relative to expected likelihood without cameras, based on changes at control intersections.
  
  
  RESULTS
  At camera intersections, there were significant reductions 1year after ticketing in odds of violations occurring at least 0.5s (39%) and at least 1.5s (86%) after lights turned red, relative to expected odds without cameras, and a marginally significant 48% reduction in violations occurring at least 1s into red. At non-camera intersections on corridors with camera intersections, odds of violations occurring at least 0.5s (14%), 1s (25%), and 1.5s (63%) into the red phase declined compared with expected odds, but not significantly. Odds of violations increased at the non-camera intersections located on other Arlington County travel corridors.
  
  
  CONCLUSIONS
  Consistent with prior research, red light violations at camera-enforced intersections declined significantly. Reductions were greater the longer after the light turned red, when violations are more likely to cause crashes. Spillover benefits were observed only for nearby intersections on travel corridors with cameras and were not always significant.
  
  
  CONCLUSIONS
  This evaluation examined the first year of Arlington County's red light camera program, which was modest in scope and without ongoing publicity. A larger, more widely publicized program is likely needed to achieve community-wide effects.
authors: Insurance Institute for Highway Safety, 1005 North Glebe Road, Arlington, VA, USA. Electronic address: amccartt@iihs.org.
authors: Anne T
authors: AT
authors: McCartt
authors: Insurance Institute for Highway Safety, 1005 North Glebe Road, Arlington, VA, USA.
authors: Wen
authors: W
authors: Hu
mesh_terms: D000054:Acceleration; D000063:Accidents, Traffic / Q000517:prevention & control*; D001334:Automobile Driving / Q000331:legislation & jurisprudence*; D006801:Humans; D035846:Law Enforcement; D016015:Logistic Models; D010781:Photography / Q000295:instrumentation / Q000379:methods*; D014768:Virginia
keywords: Red light cameras; Red light running; Red light violations