The unique articulated structure and extra-long body of the trailer result in natural visual blind spots. The "inner wheel difference" blind spot formed on both sides of the connection between the main vehicle and the trailer makes it difficult for the driver to detect non-motor vehicles or pedestrians running parallel at close range; the vertical blind spot behind the rear of the vehicle can reach more than 15 meters. When the rear vehicle enters this area, the driver cannot observe it even through the rearview mirror; the right front of the vehicle is also blocked by the front of the vehicle, and there is also a blank field of vision. According to statistics, more than 60% of right-turn scratch accidents originate from this area. These blind spots are like "invisible killers" that can easily cause collision accidents during operations such as changing lanes, turning, and reversing, causing serious casualties and property losses.