Unterlaufunterstützung

Unterlaufunterstützung, a German term, translates to "under-run support" or "underrun protection" in English. It refers to a safety feature designed to prevent vehicles, particularly trailers and semi-trailers, from sliding underneath the chassis of another vehicle in a collision. This is a critical safety measure, especially in side-impact accidents or when a smaller vehicle collides with the rear of a larger one.

The primary function of unterlaufunterstützung is to absorb and dissipate impact energy, thereby reducing the severity of the collision and protecting occupants of both vehicles. It typically consists of a robust bar or beam positioned horizontally at the rear and sometimes the sides of a vehicle's chassis. This bar is designed to withstand and deform under significant force, preventing the vehicle or its trailer from underrunning the vehicle in front.

Regulations regarding unterlaufunterstützung vary by region and vehicle type. In many jurisdictions, such as the European Union, it is a mandatory safety requirement for trucks and trailers. The specific design, dimensions, and strength requirements are detailed in technical standards and regulations to ensure effective protection. The implementation of this safety feature has significantly contributed to reducing fatalities and serious injuries in road accidents involving commercial vehicles.