I've thought I heard over the years that airbags are supposed to go off in the event of a front end collision over 5 or 10mph.... Is this true? And how are they supposed to work(what speed do are they supposed to deploy at, what type of impact is needed, etc..)... A friend of mine was in an accident with an 02 Dodge 3/4 pick-up 4x4 Cummins. Hit a tree head on at about 30mph. The impact was about dead center of the truck slightly bend the frame ends and serverely bending the front frame crossmember. The airbags never deployed.