Implementation of Active Traffic Management Strategies for Safety on Congested Expressway Weaving Segments
Implementation of Active Traffic Management Strategies for Safety on Congested Expressway Weaving Segments
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DOI：
10.3141/2635-04
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发表时间：
2017-01-01
影响因子：
1.7
通讯作者：
Lee, Jaeyoung
中科院分区：
文献类型：
--
作者：
Wang, Ling;Abdel-Aty, Mohamed;Lee, Jaeyoung
在交织段中，交通在有限的空间内合并、分流和交织。这些交通操纵可能导致高碰撞危险。为了提高拥挤的高速公路交织段的安全性，本研究在微观模拟中测试了各种主动交通管理（ATM）策略。碰撞几率和替代安全评估模型被用来评估ATM策略对交通安全的影响。碰撞几率是根据交织段的实时安全分析模型计算的。这些策略包括匝道控制（RM）、可变限速（VSL）和综合RM和VSL（RM-VSL）。总体而言，结果表明，ATM策略提高了研究交织段的安全性。改进后的ALINEA RM算法综合考虑了车道占用率和安全性，从安全性的角度来看，其性能优于传统的ALINEA算法。45 mph的VSL位于研究交织段的上游，显著提高了安全性，而没有显著增加平均旅行时间。提出了一个综合的RM-VSL策略，旨在通过实施RM和VSL来改善交通安全。在合并的RM-VSL策略中，修改后的ALINEA RM根据队列长度进行调整，以防止坡道上的长队列。结果证明，合并RM-VSL策略减少了16.8%的冲突数量，降低了6.0%的碰撞几率。
In weaving segments, traffic merges, diverges, and weaves in a limited space. These traffic maneuvers might result in high crash hazards. To improve the safety of a congested expressway weaving segment, this study tested various active traffic management (ATM) strategies in microsimulations. Crash odds and the Surrogate Safety Assessment Model were used to evaluate the impact of ATM strategies on traffic safety. The crash odds were calculated based on the real-time safety analysis model for weaving segments. The strategies included ramp metering (RM), variable speed limit (VSL), and integrated RM and VSL (RM-VSL). Overall, the results showed that the ATM strategies improved the safety of the studied weaving segment. The modified ALINEA RM algorithms, which took lane occupancy and safety into consideration, outperformed the traditional ALINEA algorithm from a safety perspective. The 45 mph VSLs, which were located at the upstream of the studied weaving segment, significantly enhanced safety without notably increasing average travel time. A consolidated RM-VSL strategy was also proposed with the aim of improving traffic safety by implementing RM and VSL. In the consolidated RM-VSL strategy, the modified ALINEA RM was adjusted according to the queue length to prevent long queues on ramps. The results proved that the consolidated RM-VSL strategy reduced the number of conflicts by 16.8% and decreased the crash odds by 6.0%.