The installation of door rear bumper guard is to place several high-strength steel beams horizontally or obliquely in the door panel of each door, which plays the role of front and rear rear bumper guard, so that the whole car is "escorted" by rear bumper guards at the front, rear, left and right, forming a "copper wall and iron wall", so that the car passengers have a maximum safety area. Obviamente, a instalação desse tipo de guarda do para -choque traseiro da porta aumentará, sem dúvida, alguns custos para os fabricantes de automóveis, mas para os passageiros de carros, a segurança e a sensação de segurança aumentarão muito.