The University of North Carolina at Charlotte, 9201 University City Boulevard, Charlotte, NC 28223-0001, USA.
Accid Anal Prev. 2014 Mar;64:9-17. doi: 10.1016/j.aap.2013.10.035. Epub 2013 Nov 13.
The focus of this manuscript is to evaluate and assess the effectiveness of red light running camera (RLC) enforcement program in reducing crashes at signalized intersections. Data from January 1997 to December 2010 for thirty-two signalized intersections in the city of Charlotte, North Carolina, where RLCs were installed between August 1998 and August 2000 and terminated in fall 2006, were gathered, analyzed, and compared for "before the installation", "after the installation", and "after the termination" periods. Descriptive analysis and paired t-tests were performed using rear-end, sideswipe, left-turn, angle, and right-turn crashes as well as the number of total crashes. The expected number of total crashes, had RLC enforcement program not been implemented, was computed using the empirical bayes (EB) method and compared to the actual number of total crashes for "after the installation" and "after the termination" periods. Results obtained indicate that RLC enforcement program leads to an increase in sideswipe and rear-end crashes at ≥ 50% of the signalized intersections. It is effective in reducing total crashes at 50% and 16% of the thirty-two signalized intersections when analyzed considering "before the installation - after the installation" and "before the installation - after the termination" scenarios, respectively. Benefits due to reduction in the number of total crashes may be higher if RLC enforcement program is implemented at signalized intersections with (1) total entering vehicles per day less than 40,000, (2) fewer than 20 rear-end crashes per year, or (3) fewer than 5 sideswipe crashes per year.
本手稿的重点是评估和评估闯红灯摄像头（RLC）执法计划在减少信号交叉口碰撞事故方面的有效性。收集了北卡罗来纳州夏洛特市 32 个信号交叉口 1997 年 1 月至 2010 年 12 月的数据，这些交叉口的 RLC 于 1998 年 8 月至 2000 年 8 月安装，并于 2006 年秋季终止。对“安装前”、“安装后”和“终止后”三个时期的数据进行了描述性分析和配对 t 检验。使用追尾、侧面碰撞、左转、角度和右转碰撞以及总碰撞次数进行了分析。使用经验贝叶斯（EB）方法计算了如果没有实施 RLC 执法计划，总碰撞次数的预期值，并将其与“安装后”和“终止后”两个时期的实际总碰撞次数进行了比较。结果表明，RLC 执法计划导致≥50%的信号交叉口侧面碰撞和追尾碰撞增加。当分别考虑“安装前-安装后”和“安装前-终止后”两种情况时，该计划在 32 个信号交叉口中的 50%和 16%处可有效减少总碰撞次数。如果在总日进入车辆少于 40,000 辆、每年少于 20 起追尾事故或每年少于 5 起侧面碰撞事故的信号交叉口实施 RLC 执法计划，由于总碰撞次数减少而带来的好处可能更高。
