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Headlamp Levelling Devices
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 01, 1993 by SAE International in United States
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Headlamps vertical aim is analysed and discussed in relation to its effects on driving safety during nighttime conditions. The legal requirements in Europe, the U.S. and Japan are strictly dependant on the beam pattern as specified by relevant regulations, but enforcement is often questionable. Progress in lighting technologies may adversly influence the consequences of vertical misaim.
This study was designed to identify the causes of misaim, with separate evaluation of human factors and wear during operation of the vehicles. The consequences are divided into two parts (a) for the driver himself and (b) for the other road users.
The ise of levelling devices is an approach to improving the accuracy and consistency of vertical aim. The automatic versions eliminate the possibilities of misuse, and the most advanced quick-response devices resolve the problem of transient positions due to vehicle acceleration and breaking.
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CitationDorleans, G., "Headlamp Levelling Devices," SAE Technical Paper 932000, 1993, https://doi.org/10.4271/932000.
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- NHTSA Measurement of headlamp aim and the electrical and photometric performance characteristics of rear lighting systems DOT US 807930 Office of crash avoidance June 1992
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- U.S. Code of Federal Regulations October 1992
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- ECE R48-02 1993
- Technische Uberwahrungs-Verein 1993 Report