United States Department of Transportation
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External viewing of vehicle contents under varying window tinting and illumination conditions.
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1995-01-01
[PDF-2.87 MB]
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Edition:Final report.19931994.
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Abstract:The purpose of this study was to determine the degree to which motor vehicle window tint films impede a police officer's ability to see clearly into a stopped vehicle. Three hundred and twenty subjects were asked to view the contems and occupants of one of four experimemal cars. One car had no aftermarket tint film and three had varying degrees of timed windows. Although similar experiments have been conducted in the past, all yielded equivocal results because of methodological flaws. This experiment attempted to correct some of those problems and to simulate standard procedures used in traffic stops by the Virginia State Police. In general, this study found that the ability of subjects to detect occupants and objects in vehicles was substantially diminished as the level of window tinting increased. However, the detrimental effects of window tinting on viewing occupants and objects within a vehicle at night were substantially reduced when headlights and a spotlight were shone at the stopped vehicle, as would be the case in a traffic stop.
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