A reliability-based weather-responsive variable speed limit system to improve the safety of rural highways

Yasanthi, Rillagoda G.N.; Mehran, Babak; Alhajyaseen, Wael

doi:10.1016/j.aap.2022.106831

Cited by 6 publications

(1 citation statement)

References 20 publications

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“…The dynamic adjustment of appropriate speed based on the current conditions has advantages in efficiency and safety. Some studies [10,11] show that the implementation of the VSL method can reduce vehicle collisions and improve road safety. What is more, it also makes important contributions to traffic efficiency and environmental benefits [12,13].…”

Section: Introductionmentioning

confidence: 99%

Variable Speed Limit Intelligent Decision-Making Control Strategy Based on Deep Reinforcement Learning under Emergencies

Yang,

Wang,

2024

Sustainability

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Uncertain emergency events are inevitable and occur unpredictably on the highway. Emergencies with lane capacity drops cause local congestion and can even cause a second accident if the response is not timely. To address this problem, a self-triggered variable speed limit (VSL) intelligent decision-making control strategy based on the improved deep deterministic policy gradient (DDPG) algorithm is proposed, which can eliminate or alleviate congestion in a timely manner. The action noise parameter is introduced to improve exploration efficiency and stability in the early stage of the algorithm training and then maximizes differential traffic flow as the control objective, taking the real-time traffic state as the input. The reward function is constructed to explore the values of the speed limit. The results show that in terms of safety, under different traffic flow levels, the proposed strategy has improved by over 28.30% compared to other methods. In terms of efficiency, except for being inferior to the no-control condition during low-traffic-flow conditions, our strategy has improved over 7.21% compared to the others. The proposed strategy greatly benefits traffic sustainability in Intelligent Transport Systems (ITSs).

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