Two studies were conducted to test the relative effectiveness of prismatic retroreflectors and retroreflective sidewall tires in increasing the nighttime conspicuity of bicycles and motorcycles. Pure detection distances were primarily dependent upon the absolute luminance values of the stimulus objects (reflectors or tires). Reflective sidewall tires, however, were highly superior to prismatic reflectors in aiding recognition of a bicycle or motorcycle in a simulated rural intersection with common nighttime visual clutter and also were of greater value in identifying the direction of movement of these vehicles. The findings suggest that standard amber and red reflectors on bicycles and motorcycles are inadequate to provide an oncoming motorist with a safe stopping distance and that shape cues can greatly enhance luminance in providing adequate advance detection and recognition.

  • Availability:
  • Corporate Authors:

    National Safety Council

    425 North Michigan Avenue
    Chicago, IL  United States  60611
  • Authors:
    • BURG, A
    • Beers, J
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00188958
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Mar 28 1979 12:00AM