Field evaluation of unlighted overhead guide signs using older drivers : research implementation plan.
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2006-04-01
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Edition:Research implementation plan.
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Abstract:STATEMENT OF NEED: In the preceding Unlighted Overhead Guide Sign Feasibility Study, it was determined that the lighting of overhead
guide signs on freeways could be eliminated if white micro-prismatic Type VII or Type IX legends were used on
green beaded Type III backgrounds. Because the expert panel in that study was limited to ODOT engineers who
were relatively young (average age 38), it was considered necessary to conduct a second study to ensure that these
unlighted overhead guide signs would meet the needs of older drivers, who have typically degraded visual
capabilities. Additionally, there was interest in evaluating Type VIII and micro-prismatic Type III sheeting
materials, which were not included in the first study.
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