Rival Car in racing game?

What i am trying to do is making a racing game…
but i cannot figure how to move the opponent car? i mean the car should move on the track automatically how to do that? can that be done by animation? but i also want my player’s car to be able to hit the opponent car.Its a single player game.
Please help.

What you are looking for is “way-points”. Many tutorials exist on the topic.

See the RainIndie tutorial for Unity.