krazik

ahh k. neck, jaw. they're basically the same thing right?

Liquidsation

Closely related but in a collision causing fracture, the results are very different.

I feel they are needed while driving on public roads and not needed while on the track. If you are on the track and you have a big hit to deloy the air bag there is no harm done but wasted money. If you are on track and you have small bumper contact but enough to deploy the air bag, now you cannot see where you are going!