Another vehicle pulled in front of my vehicle, I was unable to avoid the accident and struck the left side rear of his vehicle with my left front. The drivers side air bag did NOT deploy but the passengers side did deploy. I was wearing my seat belt as was my passenger in the right front seat, I also had a passenger in the right rear seat area and none of us were injured. I've been in contact with a couple body shops and the body shop where it's located and all of them said the drivers side air bag should have definitely deployed. No air bag lights were on prior to the accident as well as no other warning lamps. If I hadn't been wearing my seat belt I would have sustained injuries. The car is most likely totaled, the estimate is over $ 18000 and I am waiting for the insurance company to make a settlement offer.