STEERING SYSTEM LOCKED. THIS OCCURED ON THE HIGHWAY, GOING AROUND A RIGHT TURN AT 50MPH (UPHILL). IT RESULTED IN A COLLISION WITH THE CONCRETE BARRIER ON THE SIDE OF THE ROAD. THE ABILITY TO STEER RETURNED AFTER THE DRIVER YANKED THE WHEEL HARD. THE DRIVER FELT A POP AND THE STEERING RETURNED, BUT THERE WAS NO TIME TO REGAIN CONTROL OF THE CAR.