Vehicle auxiliary apparatus and vehicle auxiliary method

A vehicle auxiliary apparatus, comprising:

• a first optical sensor, disposed on a first side in a moving direction of a vehicle;
• a second optical sensor, disposed on a second side in the moving direction of the vehicle, wherein the second side is different from the first side;
• a projection system;
• and
• a processor, coupled to the first optical sensor, the second optical sensor, and the projection system, wherein the processor is configured to:
• measure a first vehicle speed of a first moving vehicle other than the vehicle through the first optical sensor;
• measure a second vehicle speed of a second moving vehicle other than the vehicle through the second optical sensor;
• and
• control the projection system to perform a warning projection within a projection range based on the first vehicle speed, the second vehicle speed, and a vehicle speed of the vehicle, wherein performing the warning projection comprises:
• calculate a braking distance based on the first vehicle speed, the second vehicle speed, and the vehicle speed;
• calculate an adjustment angle based on a height of the projection system and a road surface and the braking distance;
• and
• adjust a projection angle of each projection apparatus by driving a motor corresponding to each projection apparatus in the projection system based on the adjustment angle, so that each projection apparatus projects a projection pattern within the projection range at the projection angle.