United States Department of Transportation
i
Visual Performance and Safety Benefits of Adaptive Driving Beam Headlighting Systems
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2014-05-01
[PDF-637.15 KB]
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TRIS Online Accession Number:01603529
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Abstract:Current standards for vehicle headlighting systems specify two distinct headlight beam patterns: a low beam when driving in the presence of other nearby vehicles, and a high beam when there is not a concern for producing glare to other drivers. Adaptive technologies such as curve/bending headlight systems with steerable or swiveling headlights may contribute to increments in safety according to the Highway Loss Data Institute, but isolating the effects of lighting among other factors can be very difficult. Recent analyses suggest that visual performance improvements from adaptive curve headlighting systems might contribute to reducing nighttime crashes along curves by 2%-3%. More advanced systems such as adaptive driving beam (ADB) systems that reduce high-beam headlamp intensity in the direction of oncoming and preceding drivers are not currently permitted in the U.S. The purpose of this study is to analyze visual performance benefits and to quantify the potential for nighttime crash reductions associated with ADB headlighting systems. Before ADB systems could be allowed on roads in the U.S., it is important to have information describing their potential for nighttime crash reductions. The results from the present analyses could help inform discussions about the potential safety impacts of ADB headlighting systems in the U.S.
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