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The assumption of independent arrival process in a polling model might be unrealistic for many intersections that are part of an arterial system, because an output process of the first intersection contributes to the input process for the next intersection. The double restraint gravitational model is used to present the relationship among the traffic flow between the neighbour intersections and is mapped to the arrive rate in the polling signal timing model. In order to test the optimisation effect of the model, the basic-gated service signal timing model with historical average rate is used for comparison, and the data of the regional urban road network in Kunming are used for validation. The result shows that the model can adapt to the traffic dynamics better and achieve a lower mean vehicle delay.