Development of Automated Roadway Lighting Diagnosis Tools for Nighttime Traffic Safety Improvement, Phase II
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2022-07-31
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Abstract:Roadway lighting is a conventional roadway infrastructure provided to ensure nighttime safety and security for multimodal road users. This Phase II project aimed to enhance the methods and tools developed in Phase I to investigate the impacts of lighting patterns on nighttime pedestrian crashes, address the effectiveness of LED technologies, develop a sliding window algorithm for uniformity diagnosis, and recode the analysis engine to integrate more functions and improve processing speed. The study adopted the matched case-control method, which can address the critical issue in lighting data—the confounding effects between illuminance mean and standard deviation—to investigate the impacts of lighting patterns on nighttime pedestrian crashes. Crash Modification Factors (CMFs) for the mean of horizontal illuminance (representing average lighting level) and the standard deviation of horizontal illuminance (representing uniformity) were developed to quantify the impacts. The study also developed a Safety Performance Function (SPF) for LED technologies based on Florida Department of Transportation (FDOT) District 7 light pole inventory data. The SPF indicates that lighting upgrading projects (HPS to LED) in Florida tend to decrease nighttime crash frequency by 17%. In addition, a sliding window algorithm was developed to diagnose lighting uniformity by scanning the lighting patterns along a segment and calculating the uniformity measures within a limited area covering the driver vision field. Compared to the uniformity for the whole segment, the algorithm can provide more reasonable and detailed diagnosis of lighting uniformity. In addition to the new models, the analysis engine was recoded to include more functions and improve processing speed. The developed methods and tools are being applied in FDOT District 7’s district-wide lighting collection and analysis task. The analysis results will provide decision-making support for FDOT District 7 roadway lighting maintenance and nighttime safety management.
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