AT HIGHWAY SPEEDS, BETWEEN 70 AN 80 MPH, THE VEHICLE WILL VIBRATE UNCONTROLLABLY IF YOU HIT ANY TYPE OF POTHOLE, EXPANSION JOINT, BRIDGE, ETC..... WHILE DRIVING RECENTLY (9/5/2006), I ENCOUNTER A BRIDGE CROSSING WHILE TRAVELING AT APPROX 76 MPH, AT WHICH POINT THE VEHICLE BEGAN TO SHUTTER VIOLENTLY CAUSING MY VEHICLE TO CROSS TRAFFIC AND ENTER THE MEDIAN ON I-20 OUTSIDE OF BIRMINGHAM, AL. THIS IS AN EXTREMELY DANGEROUS SITUATION. *JB