Guidelines for Nighttime Visibility of Overhead Signs (2016) / Chapter Skim
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Pages 35-36
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35 Research Findings The principal objective of this research was to develop data-supported visibility guidelines for overhead guide and overhead street name signs. The research team reviewed the available literature, surveyed state DOT signing and lighting practices, and conducted a closed-course visibility study and an open-road visibility study involving nighttime drivers reading signs under diverse conditions.
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From page 36... ...
36 • In the open-road study, sign legend recognition decreased with increasing levels of visual complexity. However, the negative impacts of visual complexity were offset with increased levels of legend luminance.
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