Bicycle accident statistics, usage patterns, and conspicuity aids in use in South Africa are reviewed, as well as foreign research and requirements concerning bicycle conspicuity. Lack of rear conspicuity plays a major role in serious bicycle accidents. Almost all bicycles ridden on South African roads are not conspicuous at a "safe distance" from the rear at night, mainly due to inadequate rear retroreflectors, since a large portion of those being imported do not comply with Road Traffic Regulations. Visibility experiments are described for determining the minimum coefficient of luminous intensity (CIL) of rear retroreflectors. Other methods of increasing bicycle conspicuity at night are examined: rear and front lights, pedal and spoke retroreflectors, reflective tires, and front retroreflector. Also considered are means of increasing visibility during twilight and daytime: bright clothing, brighter frame colors, fluorescent flags, and bright coating on bike carriers. Among the proposed recommendations are a compulsory standard for an effective rear retroreflector (with a minimum CIL of 1.5 cd./1x.), ban on importation of retroreflectors, increased law enforcement of conspicuity requirements, and use of bright colors for clothing and large surfaces on bicycles.

  • Supplemental Notes:
    • Includes Afrikaans summary.
  • Corporate Authors:

    National Institute for Transport & Rd Res S Af

    P.O. Box 395
    Pretoria 0001, Transvaal,   South Africa 
  • Authors:
    • SATOR, WHJ
  • Publication Date: 1979

Media Info

  • Features: References;
  • Pagination: 41 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00387805
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: NITRR-TR-RV/1/79, HS-029 527
  • Files: HSL, USDOT
  • Created Date: Aug 30 1984 12:00AM