The Buick did a hard turn to the left, without any action of the driver, and went into an uncontrollable counterclockwise spin and hit the concrete divider. Prior to the accident the Buick was traveling in the right south bound lane of US 75 with the traffic flow. There was a light rain and no one was changing lanes or speeding. No other vehicle skidded or went out of control. The cause of the accident was not the weather or driver error. Possible causes for the accident are: faulty steering system, faulty antiskid system, or a computer glitch. The dealer would not talk to us. The Buick has not been inspected. No one will inspect it.