DRIVER HAD JUST PULLED OUT OF DRIVEWAY AND WAS GOING DOWN THE STREET. AFTER ABOUT 150 FEET FROM DRIVEWAY, VEHICLE SUDDENLY PULLED TO THE LEFT, HIT A PARKED VAN, RODE UP ON THE VAN'S FRONT TIRE AND ROLLED OVER. INSPECTION OF THE UNDERSIDE OF THE VEHICLE REVEALED THE THE DRIVERS SIDE LOWER CONTROL ARM HAD SNAPPED CAUSING LOSS OF CONTROL.