While driving, the vehicle began accelerating (forced acceleration) without driver input. When driver attempted to stop or slow the vehicle down, the brakes were unresponsive due to the brake override system failure. Because the vehicle could not be stopped or slowed down, and to avoid hitting or harming others, driver veered off the road which caused the vehicle to flip multiple times and finally stop, landing on the roof. It was noted that the engine was still running at that time. The safety of the driver and others was in immediate risk, as the vehicle could not be controlled. The problem has not been reproduced by a dealer or independent service center. The vehicle has not yet been inspected by the manufacturer, police, insurance representatives or others. There were no warning lamps, messages or other symptoms of the problem prior to the failure.