The distance at which pedestrians are first detected by drivers looking through clear and heat absorbing glass was determined with the aid of a headlight visibility program. An evaluation was also made of the effects on detection distance of other vehicle and environmental factors such as headlamp misaim, headlamp dirt, pedestrian reflectance, pavement type, low and high beam glare, road curvature, change in grade, and wet pavements. The following conclusions are drawn: the decrement in visibility distance to a pedestrian due to the use of heat absorbing glass rather than clear glass varies from a low of zero percent under certain glare conditions to a high of 12 percent. The average decrement due to heat absorbing glass is six percent. Visibility distance is more strongly affected by such vehicle factors as headlamp dirt and headlamp misaim than by the nature of the windshield glass. The roadway environment, i.e. , road curvature, pedestrian location and reflectance, the presence of an oncoming glare vehicle, also affects visibility distance more strongly than the nature of the windshield glass.

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  • Corporate Authors:

    Illuminating Engineering Society

    120 Wall Street, 17th Floor
    New York, NY  United States  10005-4001
  • Authors:
    • Bernstein, A
  • Publication Date: 1978-4

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00183282
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: HS-023 536
  • Files: HSL, TRIS
  • Created Date: Dec 29 1983 12:00AM