ON 3-23-11 WHILE MERGING ONTO THE EXPRESSWAY, THE RIGHT REAR WHEEL OF MY 2008 CORVETTE Z-06 BROKE OFF AT THE LUG NUTS. BECAUSE I WAS ACCELERATING AT THE TIME, ALL THE POWER WENT TO THE LEFT REAR CAUSING MY CAR TO TURN VIOLENTLY TO THE RIGHT AND SMASH INTO THE CONCRETE RETAINING WALL. THE CAUSE OF THE ACCIDENT WAS A FAILURE IN THE CASTING OF THE ALUMINUM WHEEL. THE POLICE REPORT LISTS CAUSE AS EQUIPMENT FAILURE,WHEEL BROKE OFF VEHICLE. THE CAUSE IS OBVIOUS WHEN LOOKING AT THE VEHICLE, DUE TO THE FACT THE THERE WAS NO IMPACT INTO THE WALL BY THE REAR OF THE CAR. GM WILL NOT EXAMINE THE CAR PROPERLY.