Evaluation of portable retroreflectometer for use on pavement marking materials.
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1981-01-01
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Abstract:The subjective rating of the night visibility of pavement marking materials is difficult as it can be influenced by many variables. In an attempt to provide an improved method of determining the night visibility of these materials, a portable retroreflectometer was fabricated, and its precision and accuracy in determining night visibility were evaluated. It was concluded that the apparatus can be used to accurately measure the relative amount of reflected light for the entrance and observation angles built into it.
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