Most notable is BMW's Head Protection System, which consists of a tubular airbag on each side of the cabin anchored at the base of the windshield pillar and above the rear door. In the event of a side impact, the tube inflates, breaking away from the trim panels that conceal it, and serves as a barrier between heads and hard surfaces that would cause serious injury. Tests have shown the head protection system markedly improves survivability in side impacts.
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