Journal of South China University of Technology(Natural Science) >
Evaluation of Utility and Optimal of Variable Speed Limit Value for Bridge in Foggy Condition
Received date: 2022-11-19
Online published: 2023-06-20
Supported by
the National Natural Science Foundation of China(52072012)
To improve the traffic safety of highway bridge sections in foggy environments, this paper considered the influence of variable speed limit signs on driving behavior. To obtain the best effect, it put forward a quantitative evaluation method from the perspective of the obedience effect. Taking E’dong Yangtze River Bridge as the prototype, this paper selected the lowest visibility （100 m） and free flow service level of the bridge in recent years as the test environment. Three speed limit strategies were designed, namely, the control group SⅠ (no speed limit strategy）, the experimental group SⅡ (90~70 km/h speed limit strategy), and the experimental group SⅢ (90~70~50 km/h step-by-step speed limit strategy）. Relying on the driving simulator, the micro-driving behavior data of foggy bridge scenes with different speed limit conditions were realized. The action mechanism of variable speed limit signs and driver characteristics were analyzed from the rapidity, stability, and accuracy of driver response by repeated measure analysis of variance, and the effectiveness of different speed limit strategies was evaluated using the fuzzy comprehensive evaluation method. The results show that the variable speed limit sign can make the driver take deceleration measures earlier, and the vehicle’s stability in the fog area is better. When the visibility is 100 m in fog, the steady-state frequency of 90~70~50 km/h step-by-step speed limiting strategy is more significant, the spatial stability is better, the speed overshoot and the following ratio are more minor, and the response accuracy is higher. The results of the fuzzy comprehensive evaluation show that the 90~70~50 km/h step-by-step speed limit strategy, as the optimal scheme, can effectively improve the adaptability of driving behavior in fog areas, reduce driving risk, and improve the stability of vehicle operation. The research results provide a solution for setting variable speed limit signs for bridges on foggy days and can provide adequate support for the active safety prevention and control of bridges on foggy days.
ZHANG Jianhua, ZHAO Xiaohua, OU Jushang, et al. . Evaluation of Utility and Optimal of Variable Speed Limit Value for Bridge in Foggy Condition[J]. Journal of South China University of Technology(Natural Science), 2024 , 52(1) : 127 -138 . DOI: 10.12141/j.issn.1000-565X.220765
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