Analysis of red light violation data collected from intersections equipped with red light photo enforcement cameras

234540421Project Memorandum; October 2003 \uc2\ubf October 2005PDFTech ReportDOT-VNTSC-NHTSA-05-01DOT HS 810 580PPA # HS-19Red light runningIntersectionsSignalized intersectionsIntelligent transportation systemsCamerasSacramento (California)United States. National Highway Traffic Safety AdministrationYang, C. Y. DavidNajm, Wassim GJohn A. Volpe National Transportation Systems Center (U.S.)NTL-OPERATIONS AND TRAFFIC CONTROLS-OPERATIONS AND TRAFFIC CONTROLSNTL-LAWS AND REGULATIONS-LAWS AND REGULATIONSNTL-INTELLIGENT TRANSPORTATION SYSTEMS-INTELLIGENT TRANSPORTATION SYSTEMSNTL-INTELLIGENT TRANSPORTATION SYSTEMS-Roadway Operations and MaintenanceNTL-SAFETY AND SECURITY-Highway SafetyVolpe National Transportation Systems Center, Technical Reference CenterBTS Data DirectoryThis report presents results from an analysis of about 47,000 red light violation records collected from 11 intersections in theCity of Sacramento, California, by red light photo enforcement cameras between May 1999 and June 2003. The goal of thisanalysis is to understand the correlation between red light violations and various driver, intersection, and environmental factors.Descriptive statistics suggest that younger drivers under 30 years of age are more likely to run red lights than drivers in other agegroups. About 56 percent of the violators were traveling at or below the posted speed limit. Moreover, 94 percent of theviolations occurred within 2 seconds after the onset of red light, and only 3 percent of the violations were recorded 5 secondsafter the onset of red light. Approximately 4 percent of the violators were repeat offenders. Logistic regression modeling showsthat the predicted odds of a younger driver running a red light at speeds greater than the speed limit is about 1.5 times the odds ofa middle-aged driver. In addition, older drivers have a higher probability of running a red light when the elapsed time since theonset of red light is more than 2 seconds compared to younger drivers. Finally, red light violations rates are estimated between 6and 29 violations per 100,000 intersection-crossing vehicles