Volume 40 Issue 4
Aug.  2022
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Article Navigation >  Journal of Transport Information and Safety  > 2022  >  40(4): 54-63
GUO Yaming, LI Meng, LI Yunxuan, YAN Huimin, WANG Xiaoyan. Capacity of Mountainous Roads with Ice and Snow Pavement During Beijing Winter Olympics Based on a Safe Speed Model[J]. Journal of Transport Information and Safety, 2022, 40(4): 54-63. doi: 10.3963/j.jssn.1674-4861.2022.04.006
Citation: GUO Yaming, LI Meng, LI Yunxuan, YAN Huimin, WANG Xiaoyan. Capacity of Mountainous Roads with Ice and Snow Pavement During Beijing Winter Olympics Based on a Safe Speed Model[J]. Journal of Transport Information and Safety, 2022, 40(4): 54-63. doi: 10.3963/j.jssn.1674-4861.2022.04.006
shu

Capacity of Mountainous Roads with Ice and Snow Pavement During Beijing Winter Olympics Based on a Safe Speed Model

doi: 10.3963/j.jssn.1674-4861.2022.04.006

  • School of Civil Engineering, Tsinghua University, Beijing 100084, China

  • Received Date: 2022-03-10
    Available Online: 2022-09-17
    Abstract
  • A novel challenge for traffic management is setting speed limits as well as guaranteeing road capacity under complex mountainous roads under the condition of ice and snow pavement. A safe speed model is proposed to solve this problem in Yanqing competition zone of Beijing Winter Olympics. The model studies relationships of safe speed, road alignment design, and adhesion coefficient, taking the safe speed as a basis to obtain the critical road capacity of mountainous roads under different conditions. A three-dimensional spatial model of mountainous road is developed by combining road horizontal curve, vertical curve, and cross section data. Based on the model, the forces acting on the vehicle in a mountainous road section of horizontal and vertical alignments is analyzed. The relationships between the safe speed and its influencing factors including radius of curves, road superelevation, downward slope, and adhesion coefficients of road is studied. The road capacity is analyzed based on the safe speed model. Two pavement conditions and two vehicle types are selected as case studies to obtain safe speeds on ice and snow pavement of mountain roads under different conditions. A total of 20 simulation scenarios are designed by VISSIM to verify the safe model. Combined with the actual traffic data, the simulation results show that compared with the traditional full speed limit model, the travel time of the developed model can reduce by 38% (car) and 32% (bus) with ice pavement; and reduce by 26% (car) and 24% (bus) with snow pavement. In addition, there is a phase transition from free flow to saturated flow in the traffic flow of mountainous road. The maximum road capacity for cars of the downward slope with ice pavement is 241 vehicles/h (one-way driving) and 231 vehicles/h (two-way driving); for buses is 227 vehicles/h (one-way driving) and 222 vehicles/h (two-way driving). The maximum road capacity for cars of the downward slope with snow pavement is 319 vehicles/h (one-way driving) and 249 vehicles/ h (two-way driving); for buses is 301 vehicles/h (one-way driving) and 236 vehicles/h (two-way driving).

     

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