Road User Understanding of Bicycle Signal Faces on Traffic Signals (2020) / Chapter Skim
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The review of the literature found no published research studies that directly addressed visibility and comprehension of the bicycle signal face or the transferability of design assumptions from motor vehicle users. While the research found some anecdotal evidence of driver confusion with bicycle signals due to lack of separation between vehicular and bicycle traffic signal faces, none of the published evaluation reports found evidence of significant user confusion.
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• Guidance on selection of lens size considering visibility distance, including 4-inch near-side signal heads. The agency interviews also identified other research needs not related to road user comprehension, including quantifying the tradeoffs associated with signal timing and phasing strategies for bicyclists, guidance on bicycle detection and feedback confirmation, and examination of current guidelines for the inclusion and duration of yellow change and red clearance intervals.
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Research needs statements, describing the background, research objectives, and proposed tasks necessary to address the gaps were then developed.
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