Adaptive driving beam headlights : visibility, glare and measurement considerations.

Details

• Alternative Title:
  Visual performance and safety benefits of adaptive driving beam headlighting systems.
• Creators:
  Bullough, John D. ; Skinner, Nicholas P. ; Plummer, Timothy T.
• Corporate Creators:
  Rensselaer Polytechnic Institute. Lighting Research Center
• Corporate Contributors:
  Transportation Lighting Alliance
• Subject/TRT Terms:
  • Headlamps
  • Visibility
  • Glare
  • In vehicle sensors
  • Adaptive control
  • Highway safety
  • Photometry
  • Adaptive driving beam (ADB) systems
• Publication/ Report Number:
  TLA 2016-01
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Rensselaer Polytechnic Institute. Lighting Research Center
• Abstract:
  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
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31079/dot_31079_DS1.pdf
• File Type:
  [PDF - 1.79 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:1220aadb69305a551a20a00da46caea082a8f0387b21f06aca21680028126d77