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45th Annual Meeting AASHO American Automobile Association analysis of variance auxiliary task blank signs color vision Committee on Night conventional headlamp condition dark adaptation dark twilight day-hill background day-snow dots seen Effect of relative Experiment Figure fixation footcandle glare high beam indicated Interstate letter brightness levels lighted headlamp low beam luminous intensity mean detection distances mean number Michigan State University midnight motorists National Academy Nela Park night background night driving Night Visibility number of dots observers oncoming one-eyed car percent perimetric peripheral rate of closure reflectorized and conventional reflex-reflective relative coincidence reports responses retina road Safety screen shown shows shrinkage SIGN BRIGHTNESS sign position significant signs were seen simulated rain conditions simulated signs slides sponsored by Committee stereopsis subjects tachistoscopic target test car tion Traffic Engineering traffic volume twilight backgrounds variables vehicle headlight beams Visibility and presented visual acuity visual field weather conditions