Finish in first place in arcade mode to unlock Ghost Car mode, which allows you to drive through other cars.
Rookie mode Australia
Look for a tarmac on the right side of the track about half way through. Use it to cut the corner before the long curve with a high fence on the right.
Rookie mode Britain
Use the two tarmacs on the left side of the track about half way through.
Rookie mode Canada
Drive slightly to the right on all chicanes and do not slow down on the last chicane.
Rookie mode France
Do not slow down on all the chicanes, and cut across the last corner.
Rookie mode Germany
Cut across the grass for a shortcut at the second and third corners. On the third corner, go straight on to avoid the second timed section.
Rookie mode San Moreno
Drive straight on all the chicanes.
To drive the Safety Car, change the difficulty setting from rookie and go through a World Championship with a fast car (Ferrari, McLaren). Every time you finish first, you will unlock a Safety Car track. When you finish the season, go to "Rewards" and select "Safety Car Time Attack Mode". Choose from the tracks you have unlocked and press X. You can drive a Safety Car around that track.