Vehicle headlamps do not provide adequate seeing distances in night driving conditions in which fixed (street) lighting is not provided. This may partly account for the greater accident rate at night than in daytime. Therefore, there is a need for improved vehicle headlighting. This paper describes an integrated approach toward the investigation of various problems that detract from the effectiveness of current headlighting and the development of experimental and analytical procedures that can be used to develop improved vehicle headlighting systems. Studies were conducted of a number of factors which affect the aim of headlamps, including the ability of persons in the service trade to aim lamps, the effectiveness of factory aim, the effects of vehicle service and of vehicle loading on headlamp aim. In this way the major factors that contribute to poor aiming of headlamps were discerned. Effort was devoted toward the development of an acceptable field testing method. A dynamic field test method, using driver subjects, was devised, including the development of suitable vision targets. An analytical model was developed and verified against the field test data. It is found that the mid beam concept will provide increased seeing distances for drivers in the lane being traveled and to the right of the lane when meeting another vehicle on a two-lane road and on divided highways. /HSRI/

  • Supplemental Notes:
    • Proceedings of the 18th Annual Meeting of the Human Factors Society, Santa Monica, October, 1974.
  • Corporate Authors:

    Human Factors Society

    1134 Montana
    Santa Monica, CA  United States  90403
  • Authors:
    • Mortimer, R G
    • Becker, J M
    • Olson, P L
  • Publication Date: 1974-10

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 6 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00264490
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Files: TRIS
  • Created Date: Jan 16 1975 12:00AM