The airbags did not deploy. My wife and I were discussing that as we sat in the truck waiting for law enforcement to arrive. I wonder how much of an impact it takes?
It takes a pretty good one. It isnt so much the speed of either vehicle, but the force of the impact. There is basically a G meter that once a certain threshold is reached, they pop. If front airbags, that "g-meter" is oriented accordingly. So a side impact, no matter how hard, wont set them off. Likewise, a front corner hit takes a harder hit than a full frontal.
With the G meter, IOW, if you hit a brick wall that dont give a bit at 30 MPH, it is a harder hit than a 40MPH collision with a parked car. Cause that parked car will move and absorb some of the G's.
They pretty well have it set (though tons of testing) when to set them off. If they go off, its cause they were really needed.
It sounds like it wasnt bad enough for you and your wife to warrant them going off. And glad you are both okay.
Another thing, and I dont know if it is still true, but in some vehicles they wont deploy unless you are buckled up. Cause the Airbag works in conjunction with the seatbelt pre-tensioner. And without the belt, the airbag may make things worse.