Okay, someone will have to explain this to me. To me, it looks like the car was on the road, being driven, and then abandoned. Wouldn't it have been quicker to simply drive in whatever direction was safest? I mean, the stop sign doesn't even looked singed. Wouldn't the heat alone be enough to do damage 100 feet away?
That pic was taken with a high power telephoto lens from a long distance. That flattens out the depth of field in the photo. That stop sign could be a couple miles beyond the burned cars.