Cash Cab is a TV game show devised by Adam Wood that originated in the United Kingdom and has been licensed to television networks in numerous other countries. Passengers in a specially outfitted taxi

Taxicab

A taxicab, also taxi or cab, is a type of vehicle for hire with a driver, used by a single passenger or small group of passengers, often for a non-shared ride. A taxicab conveys passengers between locations of their choice...

 are surprised and offered the chance to win money by correctly answering a series of general knowledge or trivia questions on the way to their destination.

There was some minor controversy regarding two participants in the US version of Cash Cab, who alleged that certain aspects of the show were staged.