Information processing device

An information processing device comprising:

• a communication unit configured to communicate with a plurality of vehicles;
• and
• a control unit configured to
• calculate a timing of switching hand signals performed by a traffic controller at an intersection at which two roads intersect, based on a traffic volume near the intersection, the hand signals including i) a first signal that allows vehicles on a first road of the two roads to pass through the intersection and stops vehicles on a second road of the two roads in front of the intersection and ii) a second signal that allows the vehicles on the second road to pass through the intersection and stops the vehicles on the first road in front of the intersection,
• identify a head vehicle stopped on a road being held under the hand signals of the two roads at the intersection,
• determine whether the calculated timing of switching has been reached, and
• after determining that the calculated timing has been reached, transmit control information to the head vehicle via the communication unit, the control information based on which an in-vehicle device provided in the head vehicle is configured to perform an operation recognizable from an outside of the head vehicle, wherein
• the head vehicle is configured to operate the in-vehicle device based on the control information.