http://worldcat.org/entity/work/id/432963660

Trade-off between delineation and lighting on freeway interchanges

The objective was to determine whether, with improved delineation, performance at partially lighted interchanges can approach performance under full lighting, particularly in rain. Two field studies were conducted. The first was to determine whether transient visual adaptation (TVA) influences detection on partially lighted interchanges and could interact with lighting. It was shown that TVA occurs under partial lighting and influences detection up to 600 feet from the last luminaire. The second field study was to determine the effect of lighting, weather, and improved delineation on driver performance. Data were obtained on two exits in dry and wet weather under full lighting with baseline delineation. Data were then obtained under partial lighting, with baseline and three improved delineation systems. Partial lighting at one exit was with one luminaire, at the other with three luminaires.

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