Abstract
Sight distance is an important indicator to ensure the safety of drivers, and is also an indispensable evaluation basis in highway safety engineering. In mountainous highways, high slopes and small radius often lead to poor visibility and traffic accidents. Through the combined calculation of horizontal and vertical sections, this paper comprehensively considers the specific sizes of roadside clearance, high slope, as well as the position and height of the driver’s view point and other factors, and it analyzes the limited visibility of the driver in the process of driving right turn. An effective and simplified calculation method based on design data for three dimensional (3D) stopping sight distance (S.S.D.) in high fill sections is proposed. Finally, the S.S.D. inspection of the actual highway, based on design speed and operating speed, is carried out, and the sight distance of the calculated point is judged by comparing the value with the normal value and the calculation result of the horizontal sightline offset. The results show that the method proposed in this paper is consistent with the sight distance results obtained by the horizontal sightline offset method, which indicates the calculation method is accurate and provides a technical reference for S.S.D. evaluation in highway safety engineering.
Highlights
With the vigorous development of the global transportation industry, the total length of the world’s highways has been soaring, and the construction scope has extended from urban areas to remote areas
The method is further verified by the traditional horizontal sightline offset method (Figure 9), which is the distance between the driving trajectory and the line of sight curve
S.S.D. is the key to the safety of braking when the driver encounters obstacles in the process of driving, which is closely related to the safety of national life and property
Summary
With the vigorous development of the global transportation industry, the total length of the world’s highways has been soaring, and the construction scope has extended from urban areas to remote areas. The sight distance calculation optimization model does not3take into account the spatial characteristics of the road alignment; the graphical simulation method requires the establishment of a real three-dimensional road environment, which requires lot of vehicle width, road cross-sectional width, and radius of the curve during actual driving, but thea model work, cost, and long cycle, and cannot rapid detection road sight distance, is still ahigh two-dimensional calculation model andrealize can notthe accurately describe of thethe actual driving state [21]. Summarizing the above papers, we can know that the main analysis methods of 3D sight caused by high slope occlusion when the car is turning right, using the actual design data of the road, distance include two-dimensional sight distance calculation optimization model, graphic simulation, aand three-dimensional parking line-of-sight calculation method based on horizontal and not vertical mathematical analysis method. Model Hypothesis occlusion when the car is turning right, using the actual design data of the road, a three-dimensional parking line-of-sight calculation based on horizontal combination is established. During theofright turn of the basic curve
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