A ROCK WENT BOUNCED UP UNDER THE CAR AND SET OFF THE DRIVERS SIDE AIRBAG. THE AIRBAG BRUISED THE DRIVERS ARM AND RIBS. THE CAR SWERVE ONTO THE SHOULDER OF THE ROAD DUE TO THE AIRBAG FORCING THE DRIVER TO THE RIGHT, BUT THE CAR DID NOT LEAVE THE ROAD WAY. DUE TO THE COST OF THE REPLACING THE SYSTEM, WE WERE FORCED TO SUBMIT AN INSURANCE CLAIM WHICH THUS RAISED OUR INSURANCE PREMIUM.