Test Drive 4 Cheats (PlayStation)

For extra cars to choose from, firstly go to single player race, then choose drag race.  
Choose afast car for yourself eg. the JAG, and a slow one for the computer. Win the race
then choose quit.  When it prompts you to enter your name in the high score list, type in
SAUSAGE.

  For all the tracks in reverse direction, follow the directions above, except type on
KNACKED
  You can now save these to your memory card  and always have these optiones.

Drag Race a race and then Quit. Then, a screen will come up saying you got a high score.
Type your name as "davon".