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The significance of situation awareness theory for freeway risk analysis
Published in Xianhua Chen, Jun Yang, Markus Oeser, Haopeng Wang, Functional Pavements, 2020
C. Yuan, Q. Dong*, X.Q. Chen, L.Y. Wang
Finally, based on the situational awareness theory, the evaluation index system and freeway risk early warning system are established, therefore, it can not only achieve the risk assessment and warning of the current freeway status, but also predict the trend of real-time risk, which is of great significance for active traffic management.
An integrated modeling framework for active traffic management and its applications in the Washington, DC area
Published in Journal of Intelligent Transportation Systems, 2021
Chenfeng Xiong, Xianfeng Terry Yang, Lei Zhang, Minha Lee, Weiyi Zhou, Mohammed Raqib
Active traffic management (ATM) is a pro-active approach to corridor traffic operations and for managing the increasing travel demand and improving travel reliability. ATM technologies may better utilize the capacity or provide additional capacity to accommodate peak-hour traffic, improve the detection and response to incidents, reduce delays resulting from recurrent congestion and/or incidents, and thus enhance the transportation network’s performance in safety, efficiency, reliability, and sustainability. Currently, an increasing number of ATM strategies have been deployed or are being evaluated across the country. For instance, adaptive ramp metering is operational in: Los Angeles, CA; Minneapolis, MN; Portland, OR; and Houston, TX (PB and University of Maryland, 2014). Dynamic speed limits have been adopted in Mobile County, AL; Flagstaff, AZ; Pittsburgh, PA; Texas; and northern Virginia (Asare & Smith, 2014; Nezamuddin et al., 2011; PB and University of Maryland, 2014). Dynamic lane control strategies are seen in Virginia and Washington State (Francis, 2013; PB et al., 2007). The expected benefits of ATM include: (1) more efficient and reliable passenger and freight movements; (2) increased corridor mobility and safety; (3) revenue generation and a cost-effective way of enhancing throughput; and (4) decreased fuel consumption and environmental benefits. Issues of ATM on operations and safety (e.g., distracted drivers and inevitable lane drop at the end of the shoulder-use section) are also discussed in several studies.