Adaptive Driving Beam Headlights: Visibility, Glare and Measurement Considerations

Recent developments in solid-state lighting, sensor and control technologies are making new configurations for vehicle forward lighting feasible. Building on systems that automatically switch from high- to low-beam headlights in the presence of oncoming vehicles, adaptive driving beam (ADB) systems can detect both oncoming headlights and preceding taillights and reduce their intensity only in the direction of the other lights while maintaining higher levels of illumination throughout the remainder of the field of view. The nominal benefit of ADB systems is the provision of high-beam levels of illumination in the forward scene while reducing glare to oncoming and preceding drivers, who perceive low-beam illumination levels. Two dynamic field experiments were conducted; one experiment measured the ability of observers to identify the walking direction of roadside pedestrian targets with and without using the ADB system, and the other experiment evaluated the discomfort glare elicited by the ADB system in comparison to conventional low- and high-beam headlights. The findings from both experiments are consistent with previous analytical and static field tests and suggest that ADB systems can offer safety benefits compared to conventional headlight systems. Despite these potential benefits, ADB systems are not presently defined in North American headlighting standards. Field measurements of the photometric performance of an adaptive driving bean system were made in response to simulated headlight and tail light conditions. Roadway geometries were varied and multiple measurements for many conditions were made to assess repeatability of measurements. The results of the testing are summarized in the context of validating the likely safety impacts of these systems and of providing recommendations for standardized measurement conditions to ensure reliability.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 28p

Subject/Index Terms

Filing Info

  • Accession Number: 01603668
  • Record Type: Publication
  • Report/Paper Numbers: TLA 2016-01
  • Files: TRIS
  • Created Date: Jun 13 2016 10:32AM