Increasing the conspicuity of upcoming roundabouts through larger "roundabout ahead" and "yield" signs could reduce speeds by alerting drivers ahead of time, especially at night. Enhanced landscaping of central islands as well as reflective pavement markers and yield signs at the entrance to roundabouts also could help drivers recognize roundabouts and the need to yield to circulating traffic. Certain design features (e.g., entry deflection on approach roads) also may aid in reducing speeds.
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Mandavilli et al. (2009) studied this question.
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