Abstract
The purpose of this investigation was to evaluate the relationship between highway sign brightness and alcohol impairment under night driving conditions. Sign brightness was controlled by varying sign reflectivity and headlight brightness. Data were collected under controlled conditions with the subjects actually driving the vehicle. The dependent measure was the correct reading distance. Three blood alcohol concentrations (BAC's) were investigated: sober, 0.08%, and 0.15%. Fourteen subjects participated under a different BAC on each of three separate nights.

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