FAILURE NOTIFICATION SYSTEM

A failure notification system mounted on a vehicle includes an imaging device, a processing device, and a transmission device. The processing device acquires video data of a preceding vehicle captured by the imaging device. The processing device performs failure determination based on the acquired video data. As a result of the failure determination by the processing device, when a failure of a brake light of the preceding vehicle is detected, the processing device causes the transmission device to transmit information indicating that the brake light is failed to a reception device of the preceding vehicle.