2001 TOYOTA SIENNA XLE VAN, VIN [XXX], APPROX 34,600 MILES. VEHICLE STILL UNDER MANUFACTURER'S WARRANTY OF 36 MONTHS, 36,000 MILES. DRIVING STRAIGHT, LANE 2, NB 880 N OF MARKET STREET, APPROX. 50-55 MPH (ELEVATED FREEWAY, BROKEN CLOUDS, INTERMITTENT SUNSHINE WINDY AND LIGHT RAIN (RAINBOW CONDITIONS), ROADWAY GROOVED, AND ROADWAY UNDER 4 YEARS OF AGE). SUDDENLY, STEERING LIGHT, SIMULTANEOUSLY SENSED REAR SLIDING COUNTERCLOCKWISE VIEWED ABOVE, STEERED RIGHT, COUNTER SPIN. VEHICLE 1 DARTED UNCONTROLLABLY RIGHT, GROSSLY OVER STEERING, HEADING FOR RIGHT WALL, CORRECTED STEERING LEFT VEHICLE DARTED UNCONTROLLABLY LEFT, GROSSLY OVER STEERING, CROSSING ACROSS LANE 2 TO LANE 1, HEADING FOR LEFT WALL. VEHICLE 2, IN LANE 1, MADE CONTACT, COUNTERCLOCKWISE SPIN RESULTING WITH SEVERE IMPACT WITH LEFT WALL AT RIGHT FRONT OFFSET ANGLE. VEHICLE CONTINUED COUNTERCLOCKWISE RESTING FORWARD AT AN ANGLE TO LANE 1, AND LEFT REAR OF VEHICLE SUSTAINED HEAVY DAMAGE, AWAY FROM LEFT WALL. BOTH AIRBAGS DEPLOYED. DRIVER OF VEHICLE 2 FIRST OBSERVED THAT WHEEL-SIDE END OF LEFT CONTROL ARM (LCA) OBSERVED TOUCHING ROADWAY IMMEDIATELY AFTER COLLISION. ALL 3 PARTICIPANTS OBSERVED WHEEL-SIDE END OF LCA STRAIGHT, APPEARING UNDAMAGED SAVE DISCONNECTION FROM LEFT SUSPENSION. LCA THREADS, LIKE NEW IN THE CENTER OF THREADED PORTION POINTING DOWN 90 DEGREES TO LCA, TOUCHING ROADWAY. BALL JOINT OBSERVED AT TOP,INTACT, NO DAMAGE. COLOR OF MIDDLE SECTION OF THREADED PORTION WAS BRIGHT/CLEAN, ALMOST LIGHT BRA