Evaluation of raised pavement markers.
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Evaluation of raised pavement markers.

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    This study was initiated for the purpose of researching of markers were chosen for use in this study and remained as "guinea pigs" throughout the program for the sake of uniformity.

    Several installations were made on heavily traveled roads in the Baton Rouge area using these four types. Traffic wear and breakdown properties of these markers were carefully observed as well as the effectiveness of various layout patterns on the roadway. Attempts were made in the laboratory to duplicate the types of wear and abuse encountered on these roadway installations.

    It was determined that supplementing painted lines by the use of raised pavement markers placed at 40-foot centers is very effective and practical.

    An efficient reflectivity measurement system was developed as a result of this study and is now a routine test within the Louisiana Department of Highways.

    It was learned that the six different types of epoxies studied for bonding markers to the roadway will all give satisfactory performance when used with any of the four marker types tested. Only two of the marker types tested, the Stimsonite and Ray-O-Lite, will stand up well under traffic and provide adequate reflectivity retention.

    A cross-section of section of other states' durability tests were evaluated and judged to be largely inadequate as far as correlation to roadway durability is concerned. Although one year of trial roadway service is still required for durability testing, construction of a test facility which may eventually replace this time consuming method of durability testing has been completed, and data from this device is now being evaluated. It is believed that this device has great possibilities for becoming the basis of a standard durability and reflectance deterioration test, and further work is continuing on its development.

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