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.