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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Mech. Eng. | doi: 10.3389/fmech.2019.00051

Study on the de-occlusion of the visibility window of traffic signs on a curved highway

 Jian Xiao1*, Jian Zhao1, Xia J. He2, Lin L. Yang3,  Yu Li3 and Xiao Y. Li2
  • 1School of Transportation Engineering, Changsha University of Science and Technology, China
  • 2School of Resources,Environment and Materials, Guangxi University, China
  • 3School of Electrical Engineering, Guangxi University, China

Highway navigation is often affected by complex topography, and the flat curve plays an important role in the horizontal alignment design of the highway. As a result, many curves are formed within a highway which decreases visibility. Thus, the indicative function of a traffic sign at the curve plays a crucial role for driving safety. Due to the blocking effect on visibility at the curve, the probability that the sign at the curve is occluded is quite high on operating highways. It is urgent to consider the clearing obstructions around traffic signs at curves during highway construction. In this study, the potential of visual occlusion for traffic signs on highways was investigated. Firstly, the driver’s visibility window in the presence of traffic signs was defined, and criteria of visual occlusion were proposed. Secondly, a geometric occlusion design formula was established to mimic the visual process of traffic signs on a curved highway, yielding the formula to calculate the visibility window. Finally, the occlusion design formula was applied to the Beijing-Hong Kong-Macau Expressway (Hunan section), and visibility windows were calculated and analyzed. The obtained results verified the correctness and effectiveness of the occlusion design formula developed in this study.

Keywords: Highway curves, Traffic Sign, Visibility window design formula , De-occlusion, Intelligent assisted driving system

Received: 08 Apr 2019; Accepted: 31 Jul 2019.

Copyright: © 2019 Xiao, Zhao, He, Yang, Li and Li. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mrs. Jian Xiao, School of Transportation Engineering, Changsha University of Science and Technology, Changsha, China,