Road Kill Cheat codes complete, before you enter all the codes below, better you pause the game and highlight the "Map" option. If you entered the code correctly, you will hear the sound of an engine. In this cheat codes, you will see that all vehicles, ammunition, weapon power, extra money, riot level, tornado and you will become strong enough to control the riot...
  All vehicles
Up, Down, Up, Down, Triangle, X, Triangle, X, Square, Circle(2), Square

Rapidly Restore health
Square, Circle, Square, Circle, Square, Circle, Square, Circle.

Unlimited ammunition
Triangle, Square(2), Circle, Triangle, Square(2), Circle.

Get your wepon powers up
Triangle, X(2), Triangle, Square, Circle(2), Square, X, Square, Circle, Triangle.  You still need to find where the original weapon power-up appears, then collect it again. It will also cause some weapons which you have not unlocked to appear next to your garage. However, not all weapon power-ups are next to your garage. They are usually nearby, but on a ledge or around the block.

Big big money 
Triangle, Circle, Triangle, Circle, Square, X, Square, X, Down, Up.

No more riot
Triangle, Circle, X, Square, Triangle, Circle, X, Square, Down.

You need more and more riot 
Triangle, Circle, X, Square, Triangle, Circle, X, Square, Up.

Tornado is coming
Triangle, Circle, X, Square(2), X, Circle, Triangle.