San Fransisco Rush 2094 - Platform: Dreamcast

Cheat menu
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Highlight Options at the main menu, then hold 
L + X + Y and press R. To enter the cheatcodes, 
highlight the option and quickly enter the code. 
It can be a bit tricky to get it right. 

All cars
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Press A, A, Y, Y, L, L, hold R + X. Release then 
hold L + A 

Car collisions
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Hold L + R + X + Y + A, release then press X, Y, A 

Invincibility
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Hold L + X and press Y, A, release then hold R + A + X + Y. 

Super tires
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Hold R and press X, X, X, release, then hold L and 
press A, A, Y 

Car mines
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Hold L + R + X and press A, Y, release, then press A, Y