THE INFLUENCE OF TRUCK DRIVER EYE POSITION ON THE EFFECTIVENESS OF RETROREFLECTIVE TRAFFIC SIGNS

This study evaluated the relative amount of light reaching drivers of different types of vehicles by using survey data collected in 1989 by the Transport and Road Research Laboratory (TRRL) in England. The TRRL data included driver eye heights and headlamp mounting heights for 445 vehicles. This analysis considered three sign locations on a straight roadway: left shoulder, center, and right shoulder. Two viewing distances were included: 152 m (500 feet) (typical of a sign-legibility distance), and 305 m (1000 feet) (typical of a sign-detection distance). The analysis considered both the differential amount of illumination impinging on the signs from headlamps of trucks and cars, as well as the differential amount of the light reflected from the signs in the direction of truck drivers and car drivers. Results imply that the increased eye height of truck drivers could have a major effect on the legibility of retroreflective traffic signs, but only a modest effect on their detection.

  • Supplemental Notes:
    • Sponsored by The University of Michigan Industry Affiliation Program for Human Factors in Transportation Safety. The Affiliation Program currently includes Bosch, Donnelly, Ford (Plastic Products Engineering), GE Lighting, GM (Inland Fisher Guide), GTE Products, Ichikoh Industries, Koito Manufacturing, Philips Lighting, Stanley Electric, and 3M.
  • Corporate Authors:

    University of Michigan Transportation Research Institute

    2901 Baxter Road
    Ann Arbor, MI  United States  48109-2150
  • Authors:
    • Sivak, M
    • FLANNAGAN, M
    • GELLATLY, A W
  • Publication Date: 1991-9

Media Info

  • Pagination: 19 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00616627
  • Record Type: Publication
  • Report/Paper Numbers: UMTRI-91-35, HS-041 227
  • Files: HSL, TRIS
  • Created Date: Nov 30 1992 12:00AM