As part of a study to review difficulties of drivers in viewing large guide signs, or "interferences, " on state highways in new jersey, a survey from a fast-moving automobile was performed. The surveycovered more than 1, 000 approaches to interchange exits in the 2, 000-mi new jersey system. More than 580 motorist view interferences were discovered through visual observations. The method was verified to be 94% accurate using a videotape method and a legibility formula with a sample of approaches. Sign view blockage by difficult- and expensive-to-modify highway features and furniture represented 35% of the interferences. Computer graphic interchange modeling at an earlier design stage is recommended to help avoid view blockages in the future. This paper appears in transportation research record no. 1316, Visibility for roadways, airways, and seaways 1991: proceedings ofa conference, july 25-26, 1990, washington, d.C.
Abstract