Durable, cost-effective pavement markings phase I : synthesis of current research.
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2001-06-01
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Edition:Final report.
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Abstract:Pavement marking technology is a continually evolving subject. There are numerous types of ; materials used in the field today, including (but not limited to) paint, epoxy, tape, and ; thermoplastic. Each material has its own set of unique characteristics related to durability, ; retroreflectivity, installation cost, and life-cycle cost. The Iowa Highway Research Board was ; interested in investigating the possibility of developing an ongoing program to evaluate the ; various products used in pavement marking. This potential program would maintain a database ; of performance and cost information to assist state and local agencies in determining which ; materials and placement methods are most appropriate for their use. ; The Center for Transportation Research and Education at Iowa State University has completed ; Phase I of this research: to identify the current practice and experiences from around the United ; States to recommend a further course of action for the State of Iowa. ; There has been a significant amount of research completed in the last several years. Research ; from Michigan, Pennsylvania, South Dakota, Ohio, and Alaska all had some common findings: ; white markings are more retroreflective than yellow markings; paint is by-and-large the least ; expensive material; paint tends to degrade faster than other materials; thermoplastic and tapes ; had higher retroreflective characteristics. ; Perhaps the most significant program going on in the area of pavement markings is the National ; Transportation Product Evaluation Program (NTPEP). This is an ongoing research program ; jointly conducted by the American Association of State Highway and Transportation Officials ; and its member states. Field and lab tests on numerous types of pavement marking materials are ; being conducted at sites representing four climatological areas. These results are published ; periodically for use by any jurisdiction interested in pavement marking materials performance. ; At this time, it is recommended that the State of Iowa not embark on a test deck evaluation ; program. Instead, close attention should be paid to the ongoing evaluations of the NTPEP ; program. Materials that fare well on the NTPEP test de cks should be considered for further field ; studies in Iowa.
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