Secret Push Bike Hold L1+R1 at the cabbie selection screen. Release L1, then release R1. Hold L1+R1 again, then release them both at the same time. Then, press X. A bicycle ring will ding and when you start, you're riding a taxi bike!

Highlight the character you are gonna pick and press L+R four times and press X and you have a taxi bike

Hold L1+R1+Start at the main menu. Continue to hold the buttons until the cabbie selection screen appears, then press X to select game mode and variation. "Expert Mode" will appear in the lower left corner to confirm code entry. No destination or arrows will appear in this mode.

Hold L1+Start after choosing your time limit and before the cabbie selection screen. The message "No Destination Markers" will appear in the lower left corner to confirm code entry