ECE Regulation 21 establishes uniform provisions for the approval of vehicles concerning their interior fittings, with a specific focus on passenger safety during a collision. A primary objective is to minimize the risk of injury to vehicle occupants in the event of an impact, particularly concerning the interaction with interior components. Compliance with this regulation is often demonstrated through UKAS Accredited Testing to ensure that safety standards are consistently and reliably met. This regulation mandates testing and design criteria to ensure that interior surfaces, controls, and structures are configured to mitigate injuries from secondary impacts. Crucially, ECE R21 includes detailed requirements for the behaviour of the steering mechanism in the event of an impact. This involves tests to assess how the steering column and wheel deform, retract, or otherwise react during a frontal collision, aiming to reduce the likelihood of severe chest or head injuries to the driver. The tests simulate impact scenarios to ensure the steering system effectively absorbs energy and prevents excessive intrusion into the passenger compartment, thereby enhancing occupant protection.
