Ok, so some people might really want to drive the car around. There is a way to get the car out of the track, and here's how
1. Go to the track.
2. Talk to the guy and get into the car.
3. Drive a bit to the right, then turn around so that you are facing the green flag(zoom out if that helps). There should be a "hump" nearby.
4. Back up as far as you can.
5. Drive over the "hump", and you should end up on the other side of the fence.
Enjoy riding around!
(Note- if you go to Laguna Negra, you won't keep the car)