Get a high score and enter your name as “MANOWAR ” (you must type the four spaces after the word). Now when you restart the game you are invincible, will not skid when you drive in the mud and can drive through any object!
If you have an Action Replay or similar device, you can set the cheat mode on by breaking into the program and changing the word at $7758 from $0000 to $0001. Alternatively you can bump up your score by altering the value at $6ba2. For example, set the longword to $00020000 to set your score to 20000 points. Now you can crash into the walls and you will have a high score so you can enter the cheat word.