With Physics the chances of the sprite getting stuck somewhere are like 99%
EDIT: Oh, I see you are using Car behavior now. It's not much better than Physics in this case, because car has inertia, it can't make sharp turns and takes time to stop. So it will also get stuck often.
The easiest and most obvious solution is to use pathfindind. If you have a predefined path, you can move sprite from one point to another using behaviors like MoveTo, Bullet, Tween. Also, see this post for some other examples.