You have to get rid of the targets. Don't hit any other car and get protection shields, ammunition and health hearts. Use arrows to drive and X to shoot.
A cars ame where you have to drive a garbage truck. Take care of the trash first and then drive to the dump without losing anything on the way. Use the arrow keys to drive, X for nitro.
The natural obstacles will not allow you to advance the fast as you may want. You can accelerate as much as you want, but wade across a river will not be easy for you.