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The traffic optimization control of the regional road network often involves two parts: the internal signal optimization control and the boundary flow control. This paper proposes some new methods for the traffic optimization of regional road network. First, the intersections inside the road network are divided to two types of groups by overlapping division method. Then the internal traffic flow characteristics for each type of group are analyzed to determine the vehicle distribution rate on the section. Based on the vehicle distribution rate, the vehicle capacity of the regional road network is calculated indirectly, providing reasonable threshold for boundary intersection flow control. According to previous research, a two-stage fuzzy control scheme is designed for the type-II central intersection, realizing the coordinated control between adjacent intersections and optimizing the operation of traffic flow in the regional road network effectively. Finally, the effectiveness and rationality of each method proposed in this paper are proved by simulation results.
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