TRAFFIC SIGNAL CONTROL APPARATUS, TRAFFIC SIGNAL CONTROL METHOD, AND COMPUTER PROGRAM

A traffic signal control apparatus capable of controlling signal light colors at a target intersection and a downstream intersection, and includes: an acquisition unit configured to acquire a platoon length of platoon vehicles that are traveling on an inflow road of the target intersection, and an empty space length in a planned traveling route of the platoon vehicles; and a control unit configured to determine whether or not to control the signal light color at the downstream intersection corresponding to the planned traveling route of the platoon vehicles, according to a result of comparison between the platoon length and the empty space length.