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原文传递 Effectiveness of LED Stop Lamps for Reducing Rear-End Crashes: Analyses of State Crash Data.

题名：	Effectiveness of LED Stop Lamps for Reducing Rear-End Crashes: Analyses of State Crash Data.
作者：	Greenwell, N. K.
关键词：	Automotive Lighting; Crash Avoidance; Crash Reduction; Crashes; Led; Rear Impact; Safety Engineering; State Data System; Stop Lamps; Traffic Safetyn
摘要：	The purpose of this report is to analyze the crash- reduction benefits of LED stop lamps and LED center high-mounted stop lamps (CHMSL) using real-world crash data. Previous work on this subject included laboratory experiments that suggest LED lamps were more beneficial than incandescent lamps at preventing rear-impact collisions. NHTSA statistically compared the overall ratio of rear-impact crashes to a control group of frontal impacts before and after the switch to LED. Overall, the analysis does not support a firm conclusion about whether LED stop lamps and LED CHMSL are more effective than incandescent lamps. The main analysis shows a significant overall 3.6% reduction in rear-impact crashes with LED. On the other hand, a non-parametric analysis not only fails to show improvement in significantly more than half the models, but actually shows an increase in rear impacts with LED for 9 of the 17 make-models that switched to LED. It was just the favorable results for high- sales vehicles such as Honda Accord that pulled the overall result into the plus. Furthermore, and perhaps most important, none of these 17 make-models is a clean switch pair that shifted to LED without changing anything else. All of the switch pairs shifted to LED at the same time that they changed the rear-lighting configuration and/or redesigned the vehicle. Basically, the crash data probably wont support a firm conclusion until we have more switch pairs, including some clean switch pairs.
报告类型：	科技报告