They may have worked well with crash test dummies, but real people will have to endure the quick sharp blow on their chests & faces whenever they get enabled. Just looking at how those sick airbags work makes me squeamish everytime. I don't wear seatbelts or anything of the sort, & yet I haven't encountered any on-the-road & on-the-go vehicle accidents, except for my bike "fatalities", hehe, & the blasted falling-off-the-bus-because-some-weird-fucker-decided-to-pull-me-to-the-side-by-the-arm-&-I-freaked-out incident.