document: Relation between glare and driving performance The present study investigated the effects of discomfort glare on driving behavior . Participants -LRB- old and young ; US and Europeans -RRB- were exposed to a simulated low - beam light source mounted on the hood of an instrumented vehicle . Participants drove at night in actual traffic along a track consisting of urban , rural , and highway stretches . The results show that the relatively low glare source caused a significant drop in detecting simulated pedestrians along the roadside and made participants drive significantly slower on dark and winding roads . Older participants showed the largest drop in pedestrian detection performance and reduced their driving speed the most . The results indicate that the de Boer rating scale , the most commonly used rating scale for discomfort glare , is practically useless as a predictor of driving performance . Furthermore , the maximum US headlamp intensity -LRB- 1380 cd per headlamp -RRB- appears to be an acceptable upper limit
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