TRAFFIC SIGNAL CONTROL METHOD AND CONTROLLER

PROBLEM TO BE SOLVED: To automatically generate the system offset of a kind corresponding to a traffic demand mode, to perform an offset control corresponding to the change of traffic conditions and to accurately cope with the purpose of traffic administration and the change of a traffic form at the time of controlling the traffic signal devices of road traffic altogether. SOLUTION: By the application range of a cycle length corresponding to the traffic demand mode selected in a mode selection part 25 and the kind of an offset to be generated, the system offset of a specified kind for maximizing a through-band width obtained in a signal device group to be an object is generated by the arithmetic processing of an offset generation part 26. By the control index calculation part 28 of the offset based on traffic information by a vehicle sensor or the like 22, the arithmetic processing for changing the priority for respective directions of a bidirectional system offset is performed in an offset control part 27. In a case that the kind change of the offset is specified from an operation part 37, the arithmetic processing of the kind change is performed in the offset generation part 27.