I WAS IN A COLLISION AND THE FRONT OF MY CAR IMPACTED THE REAR OF ANOTHER. I WAS DOING NO MORE THAN 35-40 MPH. I SLAMMED ON MY BRAKES. UPON IMPACT, THE AIR BAG DID NOT DEPLOY. X-RAYS FROM ER SHOWED ONLY PULLED/STRAINED MUSCLES IN BACK. I AND MY FAMILY AND FRIENDS WERE CONCERNED THOUGH THAT THE AIRBAG FAILED TO DEPLOY.