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Headlamp Levelling Devices
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English
Abstract
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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Authors
Topic
Citation
Dorleans, G., "Headlamp Levelling Devices," SAE Technical Paper 932000, 1993, https://doi.org/10.4271/932000.Also In
References
- Olson P.L. A survey of the condition of lighting equipment on vehicle in the United States SAE Technical Paper Series 850229 March 1985
- 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
- Automobile type approval handbook for japanese certification Tokyo Jasic June 1991
- Sivak M. Flannagan M. Chandra D. Gellathy AW. Visual aiming of european and U.S. Low-beam headlamps UMTRI-91-34
- U.S. Code of Federal Regulations October 1992
- EEC Directive 91/663 December 1992
- ECE R48-02 1993
- Technische Uberwahrungs-Verein 1993 Report