PROBLEM TO BE SOLVED: To suppress the occurrence of traffic congestion caused by a vehicle turning right on an upstream side of a certain distance from an intersection. A tracking data acquisition unit acquires tracking data that tracks the travel of a vehicle on a first travel path, and using the tracking data, a blocked vehicle detection unit detects the travel of a following vehicle on the first travel path. Detects a blocked vehicle that blocks. When the blocked vehicle detection unit detects the blocked vehicle, the sensitive control signal generation unit requests the termination of the green signal of the signal lamp installed for the vehicle going straight through the intersection and entering the second driving path. Generate a signal. [Selection diagram] Fig. 4
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