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摘要:
To better understand the traffic management and control needs under urban emergency evacuation situation caused by a non-notice disaster, two zones and three evacuation routes are in general identified to simplify the evacuation network planning. Two zones are referred to harm zone and buffer zone. Three types of evacuation routes are identified as: harm-zone evacuee path - the shortest path for evacuees from the target to evacuee-loading sites within the harm zone serviced by evacuation vehicles; harm-zone vehicular path - the shortest path for evacuation vehicles and on-road regular traffic within the harm zone to harm zone exits; and buffer-zone vehicular path - the shortest routes from harm zone exits to target shelters or outside of the buffer zone. However, a challenge rises in dealing with the mixed traffic of evacuation and regular vehicular flows in the buffer zone when modeling the buffer-zone vehicular path. In this study, the Integrated Arterial Signal and Access Control (IASAC) system is proposed with attempt to provide an alternative solution to buffer-zone traffic control. In the IASAC, SCOOT and BOTTLENECK systems and algorithms are coordinated together for traffic control along major corridors within the buffer zones. The algorithm embedded within the IASAC system is capable of predicting time-dependent demands of an urban corridors and coordinating signal control, and mid-block access metering control. A PARAMICS simulation-based test bed is designed for evaluating the IASAC system. A case study of two scenarios with and without IASAC control shows the potential benefit of the IASAC. © 2009 ASCE.
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