Safe operation assistance system and vehicle collision prevention method

Abstract

Onboard terminal device includes its own vehicle information acquisition section, a vehicle-to-vehicle communication section, and a collision risk determination section. The vehicle information acquisition section acquires the vehicle information including position information of an own vehicle. The vehicle-to-vehicle communication section performs wireless communications with another vehicle to communicate one's vehicle information to another vehicle and to receive the another vehicle's information, which includes position information of the another vehicle, from the another vehicle. The collision risk determination section determines a risk of collision between the one vehicle and the another vehicle by using a predetermined determination algorithm. The collision risk determination section sets priority of the one vehicle and priority of the another vehicle based on details of work, which the one vehicle and the another vehicle are performing, respectively, and changes the determination algorithm based on the priority of the one vehicle and the priority of the another vehicle.