STUDIES OF AUTOMOBILE AND TRUCK REAR LIGHTING AND SIGNALING SYSTEMS
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.
- Sponsored by Motor Vehicle Manufacturers Association, Incorporated.
Highway Safety Research InstituteHuron Parkway and Baxter Road
Ann Arbor, MI USA 48109
- Mortimer, R G
- Hoffmann, E R
- Poskocil, A
- Jorgeson, C M
- Olson, P L
- Moore, C D
- Publication Date: 1974-11
- Features: Figures; Photos; References; Tables;
- Pagination: 221 p.
- TRT Terms: Automobiles; Indicators (Instruments); Motor vehicles; Rear lighting; Trucks; Warning devices; Warning signals
- Old TRIS Terms: Rear lights
- Subject Areas: Highways; Motor Carriers; Safety and Human Factors;
- 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