What is the Federal Motor Vehicle Safety Standard relating to active headrest restraints?

The Federal Motor Vehicle Safety Standard that specifically relates to active headrest restraints is FMVSS202a. This standard addresses the design and performance requirements for head restraints in passenger vehicles, particularly focusing on minimizing the risk of neck injuries in rear-end collisions. FMVSS202a builds on the original FMVSS202 by adding additional requirements and clarifications about head restraint effectiveness, ensuring that they provide adequate protection by adjusting to the position of the occupant's head.

In the context of vehicle safety, active headrests are an important safety feature that can automatically move to better support the head and neck of an occupant during an impact, reducing the likelihood of whiplash injuries. The regulations under FMVSS202a are vital for vehicle manufacturers to follow in order to enhance occupant safety in crash scenarios.

The other options do not pertain to active headrest restraints. FMVSS202 relates to head restraint requirements in general, but FMVSS202a refines those standards further with updates. FMVSS201 pertains to head impact protection and FMVSS207 deals with seating systems, both of which do not have a direct focus on headrest designs and their active mechanisms.