Where was the car?

Mark was eatting out in a retaurant with his sister, Marie, in the middle of the mountains. It was all snowy.
When they finished, they went to the car to retourned to home, but the car wasn’t there!
Mark and Marie couldn’t believe it. They started to looked for the car during half an hour. Suddenly, Marie saw something strange behind a tree and she come over to see it better. Marie shouted and Mark started runnin to saw what happened. There was a fox beside a pile of dry leaves but the important thing was that under a lot of snow they could see a car.. his car! Finally they had to phoned the fire department to remove the car from there. The snow had covered the sign that said: parking prohibited and Mark didn't see it.