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

File Language:
English


Details

  • Alternative Title:
    Visual performance and safety benefits of adaptive driving beam headlighting systems.
  • Creators:
  • Corporate Creators:
    Rensselaer Polytechnic Institute. Lighting Research Center
  • Corporate Contributors:
    Transportation Lighting Alliance
  • Subject/TRT Terms:
  • 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

  • Format:
    PDF
  • Collection(s):
  • Main Document Checksum:
    urn:sha256:1220aadb69305a551a20a00da46caea082a8f0387b21f06aca21680028126d77
  • Download URL:
  • File Type:
    Filetype[PDF - 1.79 MB ]
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