United States Department of Transportation
i
High-beam intensity, visual performance and safety-related impacts.
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2015-10-01
[PDF-534.09 KB]
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Alternative Title:Visual performance and safety benefits of adaptive driving beam headlighting systems
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Abstract:It has been understood for many years that driving above certain speeds at night while using low beam
headlights can result in insufficient visibility to respond to hazards on the road. As new vehicle
headlighting technologies emerge, the practicality of intelligent, adaptive high-beam functions has
increased so much that these systems are now commercially available in many parts of the world. These
technical developments in turn invite questions about the optimal photometric performance of high beam
headlights. One important barrier to the more frequent use of high beam headlighting systems has been
concerns about creating glare to the drivers of oncoming and preceding vehicles. If it can be demonstrated
that adaptive high-beam control can provide acceptable glare control, it may be possible to question the
need for the current limits on the luminous intensity of high-beam headlights. In this report, visual
performance analyses are summarized that allow the evaluation of the potential benefits of increased
luminous intensity on forward visibility, and potential implications for driving safety are discussed.
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