Guide Line
In Gran Turismo Mode, on only the A and B Liscences, you can trigger the Guide Line during any test (except the Coffee Breaks). To do this, during a test, press R3 and a blue line should appear in front of you. When it shows blue, go. When it shows red, stop. I did this to get Gold on all A and B Liscence tests!
More tricks, tips and cheats for this game are right here - Gran Turismo 4 cheats
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