STOPPED AT A TRAFFIC LIGHT AT A THREE WAY INTERSECTION. WHEN LIGHT CHANGED PROCEEDED THROUGH THE INTERSECTION TO THE LEFT SPEED WAS BETWEEN 10-15 MPH HALF WAY THROUGH THE INTERSECTION WHEN THE STEERING BOX FAILED. LOST ALL STEERING AND COLLIDED WITH TELEPHONE POLE OPPOSITE THE INTERSECTION.THERE WAS NO PRIOR WARNING OR PREEMPTIVE SIGNS OF EQUIPPED FAILURE. THE VEHICLE WAS IN PERFECT WORKING ORDER AT THE TIME OF FAILURE. THE COLLISION CENTER WHO DID THE ESTIMATE ON THE TRUCK STATED HE HAD NEVER SEEN A STEERING BOX FAIL THE WAY THIS ONE DID THE PINION GEAR IN SIDE EXPLODED! *TR