The urban intersection signal decision-making in traditional control methods are mostly\nbased on the vehicle information within an intersection area. The far vehicles that have not\nreached the intersection area are not taken into account, which results in incomplete information\nand even incorrectness in decision-making. This paper presents an intersection signal control\nmechanism assisted by far vehicle information. Using the aid of real-time information collection\nfor far vehicles through vehicular ad hoc networks (VANETs), we can consider them together and\ncalculate the accumulative waiting time for each intersection traffic flow at a future moment to\nmake the optimal signal decision. Simulation results show that, under three different traffic flow\nenvironmentsâ??same even traffic flows, same uneven traffic flows, and different traffic flowsâ??the\ntwo proposed implementation schemes based on the mechanism (fixed phase and period timing\nimprovement scheme, and dynamic phase and period control scheme) show good performances, in\nwhich the average waiting time and the ratio of long-waiting vehicles are both less than the results of\nthe traditional signal timing scheme. Especially, in the second scheme, the waiting time was reduced\nby an average of 38.6% and the ratio of long-waiting vehicles was reduced by an average of 7.67%.
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