The Effects of Different Systems of Vehicle Lighting on a Driver'S Ability to See Dark Objects in Well Lit Streets

摘要

A comparison is made of the effects on the visibility of otherwise unlit objects of four types of vehicle lighting used by drivers in lighted streets. Observers were driven at 30 mile/h in a car along a straight well-lit track towards a stationary opposing vehicle showing the same type of lighting. A 4 ft high target was placed at various positions on the track between 400 feet ahead of and 300 feet behind, the opposing lights. The distances were measured at which each of six observes (a) positively detected the target, and (b) recognized the orientation of a small projection on top of the tarket. At least 3 runs were made for each of the target positions studied. (Author)