DRIVING SOUTH ON THE RIGHT LANE OF I-270, ABOUT 3/4 MILE SOUTH OF INTERSECTION WITH MD 85 WITH SPEED OF 6-65MPH. PAVEMENT WAS WET. WHEN NOTICED THAT CARS AHEAD OH ME IN THE DISTANCE OF 100 YARDS WERE SLOWING DOWN, I STEPPED MODERATELY ON THE BRAKES. THE BRAKES AND STEERING INSTANTLY LOCKED UP AND CAR WAS VIOLENTLY POOLING TO THE LEFT AND HIT THE CONCRETE GUARDRAIL IN THE MEDIAN, AFTER PASSING THROUGH THE LEFT LANE. WITH A HEAVY MORNING TRAFFIC I WAS LUCKY NOT TO COLIDE WITH ANY OTHER VEHICLE AND TO COME OUT OF THIS ACCIDENT WITH THE FEW MINOR MUSCLE ACHES. *TR