The objective was to determine the extent that transient visual adaptation (TVA) affects drivers' detection of targets along partially lighted freeway interchanges. The study expanded a preliminary task on TVA described in publication FHWA-RD-88-223. Twenty-five subjects drove 10 trials on an entrance and an exit ramp. Lighting was manipulated to provide trials in darkness, and with one, two, three, and four luminaires lighted along each ramp. The same drivers returned for a second session of 10 trials, when refractors were replaced with sharp cut-off luminaires (low glare). The drivers pressed a button on a hand-held switch when they detected the 7-in by 7-in (17.8-cm by 17.8-cm) gray targets placed on the shoulder at 350 ft (106.75 m) or 475 ft (144.88 m) downstream of the final ramp luminaire. The vehicle computer recorded distances between subjects and targets at the instant of detection.
Trade-Off between Delineation and Lighting of Freeway Interchanges: Investigation of Transient Visual Adaptation
1993
30 pages
Report
Keine Angabe
Englisch
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