The Crazy Taxi is B.D. Joe's personal Chevy Impala in the game Sonic & Sega All-Stars Racing and Sonic & All-Stars Racing Transformed. It is the same vehicle B.D. Joe uses in the Crazy Taxi video game series. It is basically a normal taxi with a driver's plate that says "2HOP260" ("To Hop To Go").
B.D. Joe's Taxi appears to be a Chevrolet Impala convertible with a yellow paint job and a TAXI sign on top of its windshield, in order to be identified as a taxi. In Sonic & Sega All-Stars Racing, his Impala gets shortened to something like a two-seater (but it still has four seats) and it performs like cars such as Beat's street machine. In Joe's All-Star Move, a passenger drops into his car, they high five each other and Joe's car goes into Crazy Dash mode while running over racers who get in his way. (Referencing his game's focus on getting from point A to point B as fast as possible)
In Sonic & All-Stars Racing Transformed, the Crazy Taxi looks much the same as the previous game's rendition, but it looks more realistic and is a two-seater. This vehicle's transformations all have the same body type, but with something added that inclines it to a race type. As a boat, it becomes a hovercraft with a huge singular propulsion fan. As a plane, it replaces its wheels with sphere-shaped boosters the color of his car.