Research notes : reflecting on road signs.
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2001-03-01
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Alternative Title:Reflecting on road signs.
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Abstract:Signs need to be visible and readable at night as well as during the day. For nighttime visibility, signs are illuminated through “retroreflection.” flection occurs when light rays (e.g. from vehicle headlights) strike the surface and are reflected back toward the source of light.
The age of the signs in the study covered a 12-year span, with signs installed from 1985 to 1997. y had retroreflectivity levels above minimum ODOT standards. No consistent relationship was found between the age of signs and their retroreflectivity. Also, the physical orientation of road signs appeared to have little or no effect on their levels of retroreflectivity.
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