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原文传递 Safety Evaluation of Red-Light Cameras. Final Rept. (9 Nov 01-30 Nov 04).

题名：	Safety Evaluation of Red-Light Cameras. Final Rept. (9 Nov 01-30 Nov 04).
作者：	COUNCIL, F. M.; ECCLES, K.; GRIFFITH, M. G.
关键词：	Traffic-safety; Accident-reduction.;Red-traffic-signals; Cameras-; Economic-analysis; Efficiency-; Intersection-collisions; Signalized-intersections; Accident-severity; Traffic-control-devices; Electronic-monitoring; Accident-prevention; Rear-end-collisions.
摘要：	This is a final report on a study to evaluate the effectiveness of red-light-camera (RLC) systems in reducing crashes. The intended audience is professionals who make decisions about safety programs for intersections. The study involved empirical Bayes before-and-after research using data from seven jurisdictions across the United States to estimate the crash and associated economic effects of RLC systems. The study included 132 treatment sites and specially derived rear end and right-angle unit crash costs for various severity levels. Crash effects detected were consistent in direction with those found in many previous studies: decreased right-angle crashes and increased rear end ones. The economic analysis examined the extent to which the increase in rear end crashes negates the benefits for decreased right-angle crashes. There was indeed a modest aggregate crash cost benefit of RLC systems. A disaggregate analysis found that greatest economic benefits are associated with the highest total entering average annual daily traffic, the largest ratios of right-angle to rear end crashes, and with the presence of protected left-turn phases. There were weak indications of a spillover effect that point to a need for a more definitive, perhaps prospective, study of this issue.
报告类型：	科技报告