It was found that 67% of all motorists traveling 18 mi section of I90 near Rapid City, SD, in Pennington and Mead Counties were using their low beams when first sighted; traffic volume increase of 2.3 times showed only 5% increase in low beam use; 66% of all motor vehicles who were on high beam when first sighted did not lower their headlights for patrol vehicle; about 2% of all vehicles on low beam when first sighted changed to high beam at moment of relative coincidence; slight upward trend was indicated in use of low headlight beams as weather conditions varied from clear skies to periods of precipitation.
Motor vehicle headlight beam usage on section of Interstate Highway 90
Nat Research Council -- Highway Research Board -- Research Rec
1967
4 pages
Article (Journal)
English
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