United States Department of Transportation
i
Evaluation of retrorefletive durability of raised pavement markers : final report.
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1975-08-01
[PDF-1.08 MB]
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Alternative Title:Evaluation of retrorefletive durability of raised pavement markers.
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Abstract:The Louisiana Department of Highways began using reflectorized raised pavement markers on a large scale basis in 1967 when such markers were placed on the Mississippi River Bridge along Route I-10 at Baton Rouge. The Department has engaged in a considerable amount of research since 1967 in order to derive the most benefit from reflectorized raised pavement markers.
A standard test procedure for measurement of retroreflection of reflectorized markers has previously been developed and adopted. A supplemental specification was also written which now requires initial minimum retrorefection values before any given brand of marker may be placed on our highways. However, the specification does not address itself to the subject of retroreflective durability. Department policy alone has required a successful 12-month field performance by a given brand of marker prior to its acceptance for routine use.
This report documents a research effort to establish a rapid method of evaluating the nighttime retroreflective durability of reflectorized raised pavement markers and to develop source acceptance criteria keyed to this test method.
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