I suppose that a late model vehicle with so many computer sensors and controls, could detect fire and extreme heat, and bring itself under control - including alignment within the lane of its travel.
I see a lot of serious car accidents on the news, and even when there is heavy damage, fire is rare and multiple explosions are VERY rare. Are people saying that the car exploded BEFORE it collided with anything? That would suggest either a serious Pinto-esque design flaw or some sort of sabotage.