In Taxi, you play the role of a taxi driver whose goal is to pick up passengers and deliver them to the airport. All the while, you have to obey the rules of the road. If you are in violation of the driving laws, then you can become targeted by the police.
Players control their taxi plus they control one police car. On your turn, roll two 6 sided dice. You assign one die to yourself and one to your police car. But you also have two optional methods for the roll: you can assign both dice to your police car move, or you can take one of your dice, assign it to your taxi, and DOUBLE it. This represents speeding, which is a violation.
Whenever you break the law, you become vulnerable to being captured by other player's police cars. Other violations include: picking up passengers from the wrong side of the road and going down one way streets the wrong way. If you are caught by police for violating the law, you lose any passengers in your cab, you go to traffic court and pay hefty fines.
Game ends when there are no more passengers to pick up. The taxi driver with the most money wins the game and is obligated to look in a mirror and say "are you lookin at me?".