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http://dx.doi.org/10.7855/IJHE.2012.14.3.131

Optimal Mixtures of Roadway Pavement Marking Beads Under Various Weather Conditions  

Lee, Seung-Kyu (아주대학교 교통연구센터)
Lee, Seung-Hyun (아주대학교 교통연구센터)
Choi, Kee-Choo (아주대학교 환경건설교통공학부)
Publication Information
International Journal of Highway Engineering / v.14, no.3, 2012 , pp. 131-140 More about this Journal
Abstract
Lane markings such as edgelines, centerlines, and lines that delineate lanes generally provide drivers with the various information for safe driving. Drivers can easily recognize the lane markings through the color differences between the markings and road surfaces during the daytime. However, it is a bit difficult for drivers to perceive them during the nighttime due to the lack of artificial lights. Although the glass beads with the 1.5-refractive index have been used to improve the visibility of the lane markings during the nighttime, it is still difficult for drivers to recognize the lane markings properly, especially during the rainy nighttime, which may often lead to traffic accidents. To improve the retroreflectivity and visibility of the lane markings during the rainy nighttime, the high refractive beads with the 2.4-refractive index are essentially required, but they do not work appropriately during the dry nighttime. Thus, the mixed materials with the 1.5, 1.9, and 2.4-refractive beads should be considered for the satisfactory implementation of the lane markings. This study reveals the best mixing rates of the beads by conducting benefit-cost analysis under various weather conditions in Korea. The analysis results show that the lane markings with the 100% of the 2.4-refractive beads provide the highest visibility of lane markings regardless of the roadway conditions, but the benefit-cost (B/C) ratio of the bead mixture is merely 0.46. The best mixing rate of the beads, from the highest B/C ratio viewpoint, was identified as the mixture with a 80% of 1.5-refractive beads and a 20% of 2.4-refractive beads. Some limitations and future research agenda have also been discussed.
Keywords
pavement marking; bead; retroreflectivity; refractive index; road safety;
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