Controller and control method for controlling operation of motorcycle

A control method that controls operation of a motorcycle (100), to which a surrounding environment detector (10) is mounted, the control method comprising:

• an acquisition step (S101) in which an acquisition section (51) of a controller (50) acquires information on a surrounding environment of the motorcycle (100) based on output of the surrounding environment detector (10) during travel of the motorcycle (100) and acquires other vehicle travel state information that is information on a travel state of a first vehicle acquired by a second vehicle (200) different from the motorcycle (100) or is information on a travel state of the second vehicle (200) acquired by the second vehicle (200), the other vehicle travel state information being transmitted from the second vehicle (200) via wireless communication;
• and
• an adaptive cruise operation performing step (S102) in which an adaptive cruise operation performing section (52) of the controller (50) makes the motorcycle (100) perform an adaptive cruise operation based on the surrounding environment information acquired in the acquisition step (S101),
• the control method further comprising safety operation performing steps (S103, S104) in which a safety operation performing section (53) of the controller (50) makes the motorcycle (100) currently performing the adaptive cruise operation perform safety operation based on the other vehicle travel state information acquired in the acquisition step (S101),
• wherein the safety operation includes an operation to urge the rider of the motorcycle (100) to make travel between lanes.