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原文传递 Predicting the Initial Retroreflectivity of Pavement Markings from Glass Bead Quality.

题名：	Predicting the Initial Retroreflectivity of Pavement Markings from Glass Bead Quality.
作者：	Aldemir-bektas, B.; Carlson, P.; Davies, C.; Hawkins, N.; Pike, A.; Smadi, O.
关键词：	Glass Bead Quality; Motorist Safety; Pavement Markings; Retroreflectivity; Roadways
摘要：	Pavement markings contribute to motorist safety by providing much needed guidance along the roadway under both daytime and nighttime conditions. Basic pavement marking characteristics such as color, width, and placement are defined clearly in the current Manual on Uniform Traffic Control Devices (MUTCD). However, roadway authorities are left to decide the minimum retroreflectivity (nighttime visibility) thresholds with which they are comfortable, if retroreflectivity is monitored at all, and achieving these thresholds is an ongoing challenge. This project developed a recommended laboratory test to predict the initial retroreflectivity of pavement markings in the field based on the quality of the glass beads. The test was expected to be rapid (i.e., preparation and testing complete in 24 hours or less), repeatable and reproducible, cost-effective, practical (i.e., suitable for routine use in a state materials testing laboratory), and verified and validated through measurements of the initial retroreflectivity of pavement markings applied in the field. The work plan for this research included two key components: a laboratory test and a field verification test, along with the necessary data collection efforts for monitoring and evaluation purposes. The laboratory component addressed the characterization of glass beads and the development of a test method to determine potential initial retroreflectivity. This process included identifying key issues that relate specific bead properties to pavement marking retroreflectivity. The field component served as a verification of the laboratory test results. The field component addressed in-place initial retroreflectivity as a function of bead properties, placement, and the interaction of beads and paint. Data collection included bead and paint properties, pavement marking installation information, retroreflectivity measurements, pavement marking images, and video from a high-speed camera.
报告类型：	科技报告