Here are all the cheats I know about crazy taxi.
Turn Off Arrow(enter before you see the character selection screen): Hold R1 and then press start. "No Arrows" will appear is entered correctly.
Switch off destination mark(enter before you see the character selection screen):Hold L1 and then press start. "No destination" will appear if entered correctly.
Unlock Expert Mode(enter before you see the character selection screen): hold L1 and R1 and then press start. "Expert" will appear if entered correctly.
Unlock Another Day: Press and hold R1 until you choose a taxi driver. "Another day" will appear if entered correctly.
Taxi Bike: At the character select screen hit L1+R1 three times quickly. If you can't get this trick to work then you can complete all the crazy box challenges.simply press up at the select screen.
Hope I Helped
Happy Gaming;-)

At the main menu, hole R1 and L1, then release R1, followed by L1.Then repeat, but this time release simultaneously and then, hit X.

Expert Mode:Just before the character selection screen appears, press L1+R1+Start. You won't get any arrow or stop indicators.

Ride a Bike:To ride a bike instead of a car, at the character selection screen, press L1, R1, L1, R1, L1, R1. Then pick a character and play as normal.

Thanks for reading, I hope I helped.

The follwing code will allow you to ride as a motorcycle in crazy taxi.

Once youve inseted credit press and hold the pedald together.

Press start gear shift up and release your pedals.

Once youve chosen your driver press gearshift down and press the start button

-Disable arrow indicators

Before the character selection screen appears, hold

R1 + Start. If you entered the code correctly, the

message "No Arrows" will appear in the lower left

corner.



-Disable destination indicator

Before the character selection screen appears, hold

L1 + Start. If you entered the code correctly, the

message "No Destination Mark" will appear in the

lower left corner.



-Expert mode

Before the character selection screen appears, hold

L1 + R1 + Start. If you entered the code correctly,

the word "Expert" will appear in the lower left

corner. No stop or arrow indicators will appear in

this mode.



-Special Taxi

At the character selection screen, quickly press L1,

R1, L1, R1, L1, R1 or L1 + R1, L1 + R1, L1 + R1.

Then, select a character to drive a bike instead of

a taxi. Alternatively, complete all sixteen Crazy

Box levels to unlock the Special Taxi for each

character, which is selectable in crazy box, arcade,

or original modes. To select the bike in crazy box

mode, scroll to the right of Gus at the character

selection screen. To select the bike in arcade or

original mode, press Up at the character selection

screen.



-Another Day mode

At the character selection screen, press R1, then

hold R1 while choosing a driver. If you entered the

code correctly, the message "Another Day" will

appear. This mode modifies various positions in the

game.



-Alternate display

Begin a game in arcade or original mode.

Hold L1 + R1 and press Circle on controller two to

toggle between first person and rear views.



Hold L1 + R1 and press Square on controller two to

view a speedometer.



Hold L1 + R1 and press Triangle on controller two to

zoom out to a pass-by pan.



Hold L1 + R1 and press X on controller two to reset

the display.



-Crazy Dash

Press Accelerate + Drive.



-Crazy Stop

Press Brake + Reverse.



-Crazy Drift

Press Left or Right while shifting as quickly as

possible into Reverse, then back into Drive at

a high speed.



-Crazy Drift Stop

Execute a Crazy Drift, then immediately execute

a Crazy Stop.