The findings of these studies of accident data, laboratory, driver simulator, and driving tests suggest that: 1) The basic signals now presented by vehicle rear marking and signaling systems should be retained, consisting of turn, stop , and hazard warning signals. 2) Evidence from this study indicates that four presence lamps, mounted in a rectangular array (Mortimer, 1970) should be used to provide improved sensitivity of following-car drivers to changes in headway. However, tests of one such configuration found it to be relatively poor in detection of stop + turn signals. Further tests, aiming to upgrade signal presentation performance, are indicated. 3) A stopped/slow-moving vehicle display should form part of a velocity signal, coded in a few (e.g., three) categories by the illumination of various numbers of lamps. While other types of signals are frequently misidentified as stopped/slow-moving, these errors are not potentially dangerous. 4) The basic concept of an integrated vehicle rear lighting and signaling system such as that defined in conclusions 2 and 3 may be similar to that proposed earlier (Mortimer, 1971). The overall effectiveness of such a display should be evaluated. 5) The marking of parked vehicles and the effectiveness of current standards of vehicle retroreflectors requires further evaluation.

  • Supplemental Notes:
    • Sponsored by Motor Vehicle Manufacturers Association, Incorporated.
  • Corporate Authors:

    Highway Safety Research Institute

    Huron Parkway and Baxter Road
    Ann Arbor, MI  United States  48109
  • Authors:
    • Mortimer, R G
    • Hoffmann, E R
    • Poskocil, A
    • Jorgeson, C M
    • Olson, P L
    • Moore, C D
  • Publication Date: 1974-11

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 221 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00132193
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Report/Paper Numbers: UM-HSRI-HF-74-25 Final Rpt.
  • Files: TRIS
  • Created Date: Nov 23 1977 12:00AM