The guard bar at the rear of a truck, also known as a rear underrun protection device (RUPD) or rear impact guard, is designed to prevent smaller vehicles from sliding underneath the truck in the event of a rear-end collision. It plays a crucial role in enhancing road safety by:
Reducing injury severity in crashes involving passenger cars and trucks.
Absorbing part of the impact energy during a collision.
Meeting safety regulations in many countries, which mandate its presence and specific strength standards.
In short, it is a safety device meant to protect occupants of smaller vehicles in case of an accident with a truck.
