The rapid technological progress and rapid social development, traffic in people's social life is also increasingly prominent role. With the volume of motor vehicles and maintain the rapid growth of traffic situation more complex, there's more and more traffic problems, particularly in the performance of intersections. This article in analyzes the municipal transportation signal control research present situation and the road intersection traffic signal control principle, in the fuzzy control theory foundation, has designed the single road intersection traffic signal fuzzy control system. Grades the fuzzy control is able to reduce the fuzzy regular number effectively, easy to withdraw the fuzzy rule, suits in the traffic condition complex city road intersection traffic signal control. The control step is determined the first universe of discourse and the fuzzy subset, experience according to the expert, establish the triangle the membership function, extracts the input variable according to the degree of membership function's definition to each fuzzy set degree of membership, has completed the fuzzy work, uses the related fuzzy control rule namely fuzzy reasoning to obtain the corresponding fuzzy set, then the solution blurs a fuzzy quantitative change is the clear quantity, after finally will solve fuzzily, obtains the internal universe of discourse transforms to the control quantity real universe of discourse, directly to controlled plant implementation control operation. Is under the establishment fuzzy control after the corresponding traffic control system's delay uating indicator analysis the cross road intersection's transportation effect truly is better, thus achieves the optimized control the goal.
key word: Cross road intersection; Signal control; Fuzzy control; The delay analyzes