No Track Thermoplastic; Final rept

摘要

The objectives of the research are (1) to search and review existing practices for installing and evaluating no track thermoplastic markings; (2) to develop a test method/procedure to determine whether a thermoplastic marking is a no track marking; and (3) to run field tests and experiments to obtain the performance data-through real applications of no track thermoplastic markings. To achieve the research objectives, real thermoplastic installation projects were arranged and test equipment/instruments were used onsite to measure the performance of industry proclaimed and marketed no track thermoplastic markings. Retroreflectivity and color were evaluated for the field test of no track thermoplastic marking materials. Four thermoplastic marking materials were selected for the field tests, including three no track thermoplastic markings and one regular thermoplastic marking. The research team found that none of the selected no track thermoplastic traffic marking materials is completely resistant to wheel tracking of asphalt. By visual inspection of traffic marking appearance in the field one cannot distinguish between no track and regular thermoplastic markings. The best parameter that can be used to identify if a particular thermoplastic marking is a no track marking is the color differences between the initial and in-service traffic markings.