1999 DODGE NEON SPORT - STEERING LOCKS UP UNDER VEHICLE MOTION, SEEMS TO PULL CAR TO THE SIDE. HAS HAPPENED ON SEVERAL OCCASIONS, THE MOST RECENT CAUSING AN ACCIDENT. WHILE TRAVELING ON A CLEAR, DRY DAY AT HIGHWAY SPEED (55 MPH+), A LANE CHANGE FROM THE RIGHT TO PASSING LANE WAS ATTEMPTED. AS THE VEHICLE WAS STEERED INTO THE LEFT LANE, THE STEERING LOCKED UP, CAUSING THE CAR TO JERK TO THE RIGHT. IN AN ATTEMPT TO REGAIN CONTROL OF THE CAR, THE STEERING SUDDENLY BECAME UNLOCKED, CAUSING OVER CORRECTION. NOW THE VEHICLE WAS MOVING HARD LEFT, CORRECTION ATTEMPT BACK TO THE RIGHT CAUSED VEHICLE TO SPIN UNCONTROLLABLY, CROSSING 2 LANES OF TRAFFIC, LEAVING THE ROADWAY, PASSING BETWEEN 2 METAL LIGHT POLES, AND STOPPING IN A DITCH. NO INJURIES, COLLISIONS WITH OTHER VEHICLES OR OBJECTS, OR MAJOR VEHICLE DAMAGE OCCURRED. VEHICLE WAS REMOVED FROM DITCH BY A TOW-TRUCK AND WAS DRIVEN HOME. CHECK OF THE POWER STEERING SYSTEM REVEALS FULL FLUID LEVEL, BELTS SEEM TIGHT, NO OBVIOUS DEFECTS SEEN. WILL HAVE VEHICLE EVALUATED BY MECHANIC ASAP. *JB