You can purchase cards that represent different car parts, colors, tires, and even a skilled car repair man. You'll need to strategically use these cards to rebuild damaged vehicles and make them roadworthy once again. As you progress through the game, you'll unlock even more cards and become a master at fixing up cars of all kinds. You can also merge your cards to further upgrade them to use on your vehicles.
Don't forget to modify your cars while repair them for more profits!