DRIVING ABOUT 30 MILES PER HOUR BEGAN TO CHANGE INTO LEFT LANE TO GO AROUND CAR AS LIGHT WAS TURNING GREEN. HEARD A LOUD SOUND THINKING MY TIRE BLEW. SUDDENLY STEERING WENT OUT OF VAN. COULD NOT CONTROL VEHICLE AS STEERING WHEEL WAS IN 360 DEGREE MOTION. HIT BRAKES TO STOP UNFORTUNATELY REAR ENDED A LADY. SHE WAS TAKEN TO HOSPITAL. WITNESS ALSO HEARD THIS LOUD SOUND THINKING IT WAS A TIRE PROBLEM. THIS IS A 2006 E 350 FORD CARGO VAN. *TR