Drive your truck as fast as you can to get to the finish line and get those extra bonus points. Make sure that you get those stars as that will also provide with additional points. Complete the word "BONUS" for additional bonus that you can get.
When driving fast, you could easily damage your car, but you don't need to worry as you can repair with the repair kit that you can get on the road. Change your truck into a monster truck once that once you get the upgrade that can also be found on the road.