WHILE I WAS DRIVING ON THE MIDDLE LANE ON BELTWAY 495 HEADING TO WORK- I SAW A HUGE TIRE HIGH IN THE AIR & DROPPING IN FRONT OF MY CAR. I TOOK MY FOOT OFF THE ACCELERATOR. IT HIT THE FRONT GRILLE & WENT UNDERNEATH MY CAR CAUSING IT TO FLY OVER THE TIRE. I LANDED SAFELY ON THE MIDDLE LANE. ( AT THE TIME I DIDN'T REALIZED THAT MY AIRBAG SHOULD HAVE BEEN RELEASED ON IMPACT.) AT ANOTHER DATE SOMEONE HIT MY DRIVER'S SIDE DOOR AT ABOUT 10 MPH & THE AIRBAG DIDN'T WORK. *TR