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原文传递 Online Traffic Simulation Service for Highway Incident Management. IDEA Program Final Report.

题名：	Online Traffic Simulation Service for Highway Incident Management. IDEA Program Final Report.
作者：	Kurzhanskiy, A.
关键词：	Congestion; Highway Incident Management; Incidents; Motorists; Traffic Simulation
摘要：	Incidents are estimated to cause somewhere between 52% and 58% of total delay experienced by motorists in all urban area population groups, according to the 2010 Urban Mobility Report. The delay estimates differ depending on where and what data are collected, and how delay caused by incidents is separated from recurrent congestion delay. More importantly, this delay cannot be predicted, whereas recurrent delay, by definition, is predictable. Among incidents that cause delay, there exists the so-called 10-90 rule: 10% of incidents account for 90% incident induced delay. The delay caused by the same type of an incident varies substantially depending on its exact location (e.g. relative to ramps, availability of shoulder) and, more importantly, on the state of traffic. The same incident, when traffic is very light or highly congested, contributes a smaller increase in delay than at other times. Clearance time significantly affects delay, especially when traffic is close to capacity: since queue lengths increase proportionally with clearance time, the freeway section will transition into congestion, and recovery will take longer. In many instances clearance time is prolonged for statutory reasons. For example, the Freeway Service Patrol is not allowed to move a vehicle to the shoulder if there is a serious accident: in case of injury, a Highway Patrol officer must be present before a vehicle can be moved. To reduce response (and hence clearance) time, it may be worth pre-positioning resources (Highway Patrol and tow trucks) to respond to incidents, but this is possible only if reliable statistical data of time and location of incidents are available.
报告类型：	科技报告