Control method and control device

A control device that controls a light transmission state of a headlight, the headlight provided in a vehicle, the vehicle capable of driving autonomously and of being driven manually, the control device comprising:

• at least one memory;
• and
• circuitry,
• wherein, using the at least one memory, the circuitry:
• obtains target attributes and position information indicating a target position where a target object is present;
• determines whether the vehicle is driving autonomously or is being driven manually;
• determines whether the position information is reliable;
• only when both the vehicle is determined to be being driven manually and the position information is determined to be reliable, inspects whether the target position is located within a predetermined region of a travel route of the vehicle based on the position information;
• when the target position is located within the predetermined region, changes the light transmission state of the headlight from a first state to a second state;
• when at least one of the vehicle is determined to be driving autonomously or the target position is not located within the predetermined region, maintains the light transmission state of the headlight;
• and
• maintains the light transmission state of the headlight when the vehicle is determined to be being driven manually and the position information is determined to be unreliable.