Retroreflective traffic stripe for both dry and wet weather conditions
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United States of America Patent
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Sep 21, 2021
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app pub date -
Apr 30, 2021
filing date -
Apr 30, 2021
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Abstract
A retroreflective traffic stripe comprising an exposed top surface containing a widely spaced repeating pattern of linear light-turning prisms over a bottom surface containing two different types of cube corner retroreflective prisms. The light-turning prisms are configured to use refraction and reflection to redirect light from distant headlights into a downward direction onto the bottom surface of the traffic stripe. Cube corner retroreflective prisms of the first type on the bottom surface have optical axes which are substantially perpendicular to the surfaces of the traffic stripe and are located substantially beneath such light-turning prisms. Cube corner retroreflective prisms of the second type on the bottom surface have optical axes tilted toward the distant headlights by at least 25 degrees and are located substantially between such light-turning prisms. Under dry road conditions, the light-turning prisms and first type of cube corner prisms provide unprecedented levels of retroreflectivity. Under wet road conditions, the second type of cube corner prisms provide high levels of retroreflectivity.
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