Effectiveness and Site Selection Criteria of Red Light Running Camera Systems

摘要

The objective of this paper was to evaluate the safety effectiveness of automated trafficenforcement systems (i.e., red light running (RLR) cameras) installed at 254 signalizedintersections in 32 jurisdictions in Texas. In addition, the criteria of site selection were evaluatedto provide analytical resource for camera installation. A before-after study using the EmpiricalBayesian (EB) methodology was performed to remove the regression-to-mean bias during theevaluation of treatments. Results indicated significant decreases in all type and right-angle RLRcrashes by 20% and 24%, respectively. A significant increase of 37% was discovered concerningrear-end RLR crashes. The study results suggest that a significant safety benefit for red-lightcameras is achieved if intersections have four or more RLR crashes per year or have two or moreRLR crashes per 10,000 vehicles. Red-light cameras show counter-productive results ifintersections experience less than two RLR crashes per year or have one crash per 10,000vehicles per year.