This study was conducted in two phases: Phase I involved the determination of threshold detection distances for simulated motorcycles using either vehicles with reflectorized sidewall tires of two brightness levels, or amber white or red prismatic reflectors. Phase II compared the relative cognizability of real motorcycles when equipped with standard (factory-installed) reflectors and/or with reflectorized sidewall tires. Results of Phase I experiment on detection thresholds indicate that the brighter the retroreflective stimulus, the farther away it could be detected, regardless of its nature, or color, or the angle of incidence of the headlight beam. Also, improvement in detection distances was found not to be proportional to brightness increase. Results of Phase II experiment, involving recognition of a stationary motorcycle when viewed in a time-stressed situation as one element in a more complex highway scene, indicates that the value of the standard side reflectors is questionable from the standpoint of aiding the driver to recognize the presence of a motorcycle at 500 feet. Even with a headlight and taillight, a standard motorcycle was correctly recognized less than half the time, when viewed from the side at 500 feet. Also, the addition of reflectorized sidewall tires to the standard motorcycle reflectors and lights more than doubles the recognition ratio.

  • Corporate Authors:

    University of California, Los Angeles

    School of Architecture and Urban Planning
    Los Angeles, CA  United States  90024
  • Authors:
    • BURG, A
    • Beers, J
  • Publication Date: 1976-11

Media Info

  • Features: Appendices; Figures; Tables;
  • Pagination: 41 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00157175
  • Record Type: Publication
  • Source Agency: National Safety Council Safety Research Info Serv
  • Files: TRIS
  • Created Date: Nov 9 1977 12:00AM