International Journal of Highway Engineering (한국도로학회논문집)

Korean Society of Road Engineers (한국도로학회)
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Optimal Mixtures of Roadway Pavement Marking Beads Under Various Weather Conditions

기상조건 변화에 따른 노면표시 비드의 최적 배합비율 산정

  • 이승규 (아주대학교 교통연구센터) ;
  • 이승현 (아주대학교 교통연구센터) ;
  • 최기주 (아주대학교 환경건설교통공학부)
  • Received : 2012.03.02
  • Accepted : 2012.04.16
  • Published : 2012.06.15
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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.

노면표시에 도포된 굴절률 1.5 유리알은 야간 우천 시 효과적인 재귀반사를 수행하지 못하여 교통안전에 심각한 문제를 초래하고 있다. 이를 극복하기 위해 습윤상태에서 효과적 재귀반사를 수행하는 굴절률 2.4인 우천형 bead와 건조 시 최적의 재귀반사를 수행해 내는 굴절률 1.9 bead를 혼합한다. 그러나 고성능의 굴절률 1.9와 2.4 bead는 기존 1.5 유리알에 비해 상당한 고가이므로 전량 사용하기에는 상당한 비용이 소요된다. 따라서 현장 설치 시에는 서로 혼합하여 사용하는 것이 바람직하며, 최적 성능과 소요 비용을 고려한 적정 배합비율을 찾아내는 것이 중요하다. 본 연구에서는 다양한 비율로 혼합된 bead를 국내 고속도로의 길가장자리선에 설치하였을 때 발생되는 각각의 비용 및 편익에 따른 경제성 분석을 수행하였다. 분석 수행결과, 다양한 강수량 변화에도 높은 시인성을 유지하는 대안은 굴절률 2.4가 100% 구성된 차선으로 나타났으며, 경제성이 가장 높게 확보되는 대안은 굴절률 1.5가 80%, 2.4가 20%로 구성된 차선으로 B/C는 약 1.92 수준으로 도출되어 국내 고속도로 길가장자리선의 적용 시 가장 효과적인 대안인 것으로 확인되었다. 아울러 연구의 한계와 몇몇 장래 연구과제가 토의되었다.

Keywords

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  1. A Study on Data Management Systems for Spatial Assessments of Road Visibilities at Night vol.22, pp.4, 2014, https://doi.org/10.7319/kogsis.2014.22.4.107