Extracting steep slope for road sliding accidents during heavy snowfall
Youngjin LEE, Kyung Hee University, Korea (Republic of)
Jinmu CHOI, Kyung Hee University, Korea (Republic of)
The cause of vehicle sliding and isolation in winter is the loss of the gradability on a steep slope of an uphill lane with heavy snowfall. In freezing road sections, rear-wheel drive vehicles have lower friction than front-wheel drive vehicles so that there is a greater risk of being isolated or slided. Therefore, this study tried to identity steep slope road sections where car sliding or isolation accidents could be occurred.
Currently, there is no gradient information provided in road data produced in Korea. Therefore, gradient information that is required to derived a steep slope road sections was extracted based on available spatial information. The gradient was calculated using the high precision road map data indicating the actual road section on which the vehicle travels.
A tool was created in ArcGIS to extract steep road sections. Elevation was extracted using contour lines and point cloud of LiDAR. The slope angle and direction of the road were calculated using the elevation information. When the tool is executed, a road section that is higher than the slope set for the direction of the road specified by a user is derived.
The tool was applied to the Yeongdong Expressway. A DEM of 5m from the contour data and a DEM of 1m from the point cloud were constructed. The maximum gradability angle of a rear-wheel drive vehicle on uphill snow is 8.5° (Chung et al, 2013). Hence, road sections that are higher than the maximum gradability angle were extracted.
In this study, a method for extracting steep slope road sections was proposed to prevent the isolation of rear-wheel drive vehicles in heavy snowfall. When heavy snow is forecasted, it would be possible to minimize vehicle sliding and isolation accidents by announcing the steep road section data using the method of this study.
Mots clés : heavy snowfall|rear-wheel drive vehicles|steep slope|elevation|point cloud
A103493YL