My vehicle had no warning lamps, messages or any other symptoms before driving that day. Vehicle was well maintained. Driving on a rural straight paved road that is in excellent condition, at approximately 55 miles per hour, smoke suddenly came through the dash top (defroster along windshield) and bottom (underneath the dash - heavier volume of smoke); almost immediately, the horn started sounding independently, a message appeared that read engine failure, brakes failed simultaneously and could not stop the vehicle. Only possible way to get the vehicle to stop was to remove the ignition key, put lever in park, pulled park break up. Flames now under the dash & smoke was pouring out from under the hood. My safety was at risk and had to exit the vehicle as fast as possible from drivers side with cars approaching. After exit, saw flames in the tire well also; witness saw flames under the car therefore he was yelling "get away from the car, it's on fire". Got away as fast as possible. The witness called the fire department who arrived extremely timely (and police even sooner). FD attempted to put out fire with water first, then needed foam as it ultimately turned into a gas tank fuel fire. The vehicle was not inspected by a dealer since there was nothing to speak of left. The Police, Fire Department, Tow Company, and also the Insurance Claim Inspector did view and/or inspect the remnants of the vehicle. The insurance inspector took possession of the remnants of the vehicle fro