United States Department of Transportation
i
Congestion-based emergency vehicle preemption.
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2010-08-01
[PDF-2.74 MB]
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Edition:Final report.
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Abstract:This research analyzed and evaluated a new strategy for preemption of emergency vehicles along a corridor, which is
route-based and adaptive to real-time traffic conditions. The method uses dynamic offsets which are adjusted using
congestion-levels to provide uninterrupted preempted green signal for the emergency vehicle throughout its route. By
achieving a higher average emergency vehicle speed, this method promises faster emergency response which results
in saving life and property as well as larger emergency service radius for the dispatch stations. The research
evaluated the effectiveness of two possible algorithms for offset adjustment using measured vehicle queues. It is
showed to reduce the emergency vehicle travel-time by 31 percent when compared to cases without preemption and
13 percent when compared to traditional method of individual-intersection preemption.
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