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- W207315755 abstract "Modern traffic signal control systems provide emergency vehicle preemption (EVP) capabilities by utilizing advanced sensors and communication technologies. EVP strategies are widely implemented by urban transportation management agencies. One of the challenges of implementing EVP under coordinated-actuated signal systems is selecting the best coordination recovery strategy at the end of preemption such that disruptions to the normal traffic signal operations are minimized. This paper reports the evaluation results of various EVP strategies in which an emergency vehicle arrives at a single approach on a coordinated-actuated traffic signal system. The evaluation was conducted at an urban corridor including four coordinated-actuated signals along Lee Jackson Memorial Highway in Chantilly, Virginia. Since field testing of various preemption strategies is impractical, the preemption study was performed using hardware-in-the-loop simulation, which consisted of a well calibrated VISSIM microscopic simulation model, four 170 controllers, and four controller interface devices. The preemption strategies under examination include transition methods (shortway and dwell) with different number of cycles for transition completion, and different sequences of phases for cross streets. The evaluation results indicated that (1) EVP caused significant increases in delays and travel times and (2) resulting impacts on the network-wide and intersection-specific performances were quite different according to selected EVP strategies. Results also indicated that (1) the EVP function using the shortway transition method with two or three cycles worked the best and (2) the phasing sequence should be considered in the development of EVP strategies as it can minimize the impact of EVP." @default.
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- W207315755 date "2007-01-01" @default.
- W207315755 modified "2023-09-23" @default.
- W207315755 title "Evaluation of Emergency Vehicle Preemption Strategies on a Coordinated Actuated Signal System Using Hardware-in-the-Loop Simulation" @default.
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