关键词: 交通紧急车辆控制策略, Dijkstrsa算法, Petri网, 路径寻优

Abstract: This paper proposes a traffic emergency control strategy model based on Petri nets to solve the problem how the emergency vehicles reach the destination faster in urban traffic network. First, based on the correspondence between travel time and traffic flow in the Davidson function, it will get shortest travel time on the road of the emergency vehicles, and then, this time is regarded as the weight to calculate the shortest path using the Dijkstrsa arithmetic. In the next place, the traffic lights in the shortest path are adjusted by the emergency lights control strategy to reduce the lag time in the intersection, in addition, the emergency traffic lights signal control model of emergency vehicles in the intersection is built using the Petri net theory. To describe the emergency signal control strategy dynamic behaviors, the key elements of its parts are designed for the corresponding Petri net models. Finally, an experimental comparison between emergency control strategy and common strategy is made through a simulation model. Experimental results show that the former can optimize the arrival time of emergency vehicles.

Key words: traffic emergency control strategy, Dijkstrsa algorithm, Petri net, path optimization