Vol. 22, Special Issue, June 2013, pp. 66-73

Abstract: Based on the researches on controlling urban artery traffic, a hierarchical control method for traffic signals at artery multi-crossings is proposed. This control method, which uses wireless sensor networks and fuzzy control method, has two layers of WSN. The first layer is a data collecting layer which consists of terminal nodes and sink nodes. This data collecting layer is responsible for collecting and transmitting vehicle information to the second layer after data fusion at the single crossings. The fuzzy controller, nested in the sink nodes, is used to accomplish traffic light control and adjusting on-line the green ratio in all directions at crossings. The second layer is the control layer, composed of coordinator nodes in which the fuzzy controller is nested. The coordinator nodes are used to receive the traffic data detected by the first layer, the real traffic data and the forecasting traffic datas are input into the fuzzy controller. The fuzzy controller determines the signal cycles at the artery. Simulation results have shown that this method is superior to the ordinary fuzzy control, effectively reducing queue length of vehicles and traffic delays.

Keywords: Wireless sensor network, Intelligent traffic, Fuzzy control, Neural network, Traffic flow forecasting.

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