ARITHMETIC OPERATION SYSTEM FOR VEHICLES

An automotive arithmetic system (SY) includes: a main arithmetic device (100) that determines a target motion of a motor vehicle so that the motor vehicle travel on a route generated based on a vehicle external environment estimated using deep learning based on an output from a vehicle external information acquisition device (M1); and a backup arithmetic device (300) that determines a backup target motion for causing the motor vehicle to travel on a travel route which is generated based on the output from the vehicle external information acquisition device (M1) and which the traveling motor vehicle takes until the motor vehicle stops at a stop position that satisfies a preset criterion. The automotive arithmetic system (SY) outputs a backup control signal to actuators in preference to a control signal when the main arithmetic device (100) fails.