We experimented with fog lamps and headlamps in various fog densities to measure their forward illumination and conspicuity. Observation of illumination at night revealed that it is possible to see an obstacle which is 20 m ahead with conventional fog lamps when the visibility is 50 m or more. However, when using low beam headlamps, the same obstacle can be seen in 30 m visibility because headlamps emit more light than fog lamps. Observation of conspicuity in the daytime proved that fog lamps do little to increase the conspicuity of an approaching car. Low-beam headlamps are more effective in increasing conspicuity in dense fog than fog lamps. We think it is possible to achieve better illumination in real driving situations in dense fog by using brighter headlamps or simultaneously using conventional headlamps and fogs lamps which have a sharp cut-off.
Observation of fog lamp visibility and conspicuity in real fog
1999
13 Seiten, 6 Bilder, 6 Tabellen, 1 Quelle
Conference paper
English
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