Turn and hazard warning signals were evaluated to determine appropriate flasher design parameters. Flash rate, duty cycle, start mode, color, and rear lighting system configuration were evaluated objectively in both day and night conditions. A subjective evaluation of flash rate and duty cycle was also conducted. The relationships between flash rate, duty cycle, nominal voltage, maximum light output, and light contrast ratio during voltage on and off phases, were explored. Recommendations were made as to areas of turn signal and/or flasher specification that should be included in the FMVSS 108 Standard. Recommendations were also made regarding potential changes in parameters included in the current standard. Further research was recommended to evaluate the effectiveness of school bus "loading" lamps and of strobe lamps, the flasher and signal problems caused by adding campers and trailers to automotive vehicles, and the effectiveness and potential problems associated with deceleration signals. Generalized results are contained in the summary of this report.

  • Supplemental Notes:
    • Sponsored by the National Highway Traffic Safety Administration, Department of Transportation.
  • Corporate Authors:

    Highway Safety Research Institute

    Huron Parkway and Baxter Road
    Ann Arbor, MI  United States  48109
  • Authors:
    • Post, D V
  • Publication Date: 1976-4

Media Info

  • Pagination: 133 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00134726
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Report/Paper Numbers: DOT/HS801/870 Final Rpt., UM-HSRI-HF-75-5
  • Contract Numbers: DOT-HS-4-01001
  • Files: TRIS
  • Created Date: Jul 22 1976 12:00AM