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Control Method of Variable Speed Limits for Freeways under Foggy Weather Conditions

机译：有雾天气条件下高速公路的变速极限控制方法

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摘要

Fog has a negative impact on freeway traffic safety and efficiency due to the reduced visibility. Variable speed limits (VSL) can improve traffic states under foggy weather conditions. However, most of the previous researches calculated the speed limits by stopping sight distance model, which is likely to cause sharp fluctuations. This paper presents a VSL control method based on the real-time road visibility and traffic states. The speed limits of road sections are determined by maximum safe speed, speed difference between adjacent sections, etc. A part of G4 freeway is selected to evaluate the proposed VSL control method, and simulation experiments are conducted by using VISSIM simulator. The simulation results show that the lowest speed has increased by 34.9%, and the maximum speed difference of adjacent links has decreased by 67.77%, compared with no VSL control. The simulation indicated that VSL control can ease the congestion caused by low visibility.
机译：由于能见度降低，雾对高速公路的交通安全和效率产生负面影响。变速限制（VSL）可以改善大雾天气条件下的交通状况。但是，大多数以前的研究都是通过停止视距模型来计算速度极限的，这很可能会引起剧烈的波动。本文提出了一种基于实时道路可见性和交通状态的VSL控制方法。通过最大安全速度，相邻路段之间的速度差等来确定路段的速度限制。选择G4高速公路的一部分来评估所提出的VSL控制方法，并使用VISSIM仿真器进行仿真实验。仿真结果表明，与无VSL控制相比，最低速度提高了34.9％，相邻链路的最大速度差降低了67.77％。仿真表明，VSL控制可以缓解低能见度引起的拥堵。

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