I'm really going to trust that this thing will deploy correctly, without interference from other objects, and stay in the right place all the way through the collision?
I'm really going to trust that the sensor is smart enough to tell what's a collision and what isn't?
I really have to wear my jacket if I want to protect my head?
Even if it worked as designed, .1 seconds is way too long.
This is a really, really stupid idea.