DRIVING UNDER 20 MPH ON DIVIDED STREET APPROACHING A BRIDGE OVER A SMALL WATERWAY. SUDDENLY FELT LEFT FRONT END GO DOWN AND SWERVE TO LEFT INTO CONCRETE BRIDGE RAILING. APPEARS THAT LEFT FRONT WHEEL ASSEMBLY CAME APART FROM DRIVE SHAFT. POLICE OFFICERS COMMENTED THAT LOOKS LIKE U-JOINT SEPARATED. *DSY *DT*JB