Title: Cash Cab (British game show)
Content:  The show's host initially poses as an ordinary taxi driver and drives around the major cities of the United Kingdom in a cab. The show pays its passengers for correctly answering standard general knowledge questions. Contestants are recruited in advance but are not told that the quiz will be taking place in the cab, so although the "pick-ups" are not as random as they appear on screen, the contestants are genuinely surprised when the taxi turns out to be the Cash Cab. (This differs from some editions, most notably the Canadian and American versions, wherein the contestants are generally chosen at random and are usually asked on camera if they wish to play or not once 
Title: Cash Cab (British game show)
Content:  rules are explained to them.) The contestants tell the driver their destination before getting into the taxi and are not allowed to change it. They'll then have the distance they'll need to travel to answer questions. The first five questions are relatively easy and worth £10 each, the next five are a little harder and worth £50, the next seven, even harder and worth £100, and any question after that is worth £500. If the contestant gets three questions wrong, they'll lose the money they have won up to that point and must leave the cab immediately. The host of Cash Cab, John Moody, is a genuine qualified taxi driver, and has an easygoing presenting style.
Title: Taxi Payant
Content:  The rules of the game are identical to its English Canadian counterpart; however, the questions in Cash Cab tend to be more scientific-related while Taxi Payant's questions can be about virtually any topic, from geography to sports to pop culture to even general trivia about the city of Montreal, Quebec, where the show is filmed in. On numerous episodes, Barrette is even seen outside the cab, asking general knowledge questions to strangers on the street for an easy $10.
Title: Cash Cab (American game show)
Content:  When the potential contestants enter the cab and state their destination, they are made aware that they are in the Cash Cab as ceiling lights and a fanfare plays inside, accompanied by the host's greeting. While the only rules given on-camera after the introduction and before asking "Do you want to play?" pertain to his or her driving and the "three strikes and you're out" rule, the contestants are also informed that once their traveling begins, the cab will not take detours of any kind unless directed by a police officer, stop sign, traffic light or other legal means of diverting traffic. Bailey offers them the chance to get out of the cab if they do not wish to play, and contestants who choose to play the game must stay in the cab until they reach their destination or get 
Title: Cash Cab (Canadian game show)
Content:  features rounds like "Shout Outs", "Red Light Challenges", and the "double or nothing" Video Bonus option at the end of each game. However, the Canadian version differs in its heavier focus on questions of science, technology, nature and adventure, as opposed to purely general knowledge. Regular questions are worth $25, $50, $100; while Red Light Challenge questions are worth $75. In the second season, a third "life line" was added: when contestants reach the $100 questions, they have the option to "swap out" a question, and the Cash Cab dispatcher will give them a new question. In the Cash Cab Vancouver season, bridge bonus was added, which doubles the score for the current question once per session. 
Title: Cash Cab (American game show)
Content:  for on-air purposes only. The winnings, which must be taxed, are sent via check. The Cash Cab in New York is a Toyota Sienna minivan with the New York City Taxi and Limousine Commission medallion number "1G12" in the first two seasons and during the After Dark shows. A new cab with the medallion "7N78" was used for seasons 3 through 7, which also features new headliner lighting. In seasons 8 and 9, the medallion was "31Z8." In Season 10, the vehicle was updated, and the medallion of the cab has been "47J2." Cash Cab: Chicago used a Toyota Sienna minivan with the Yellow Taxi call sign "4472."
Title: Cash Cab (Japanese game show)
Content: The first 2 correct answers are each worth 10,000 yen, for a running total of 20,000 yen. ; The next 3 correct answers are each worth 20,000 yen, for a running total of 80,000 yen. ; The next 4 correct answers are each worth 30,000 yen, for a running total of 200,000 yen. ; Each subsequent correct answer is worth 50,000 yen, up to a maximum running total of 500,000 yen after 15 total correct answers. Unlike most international versions, the value of each question is based on the number of correct answers, instead of the number of questions asked: The show uses video game-style "lives" instead of strikes; players start with three lives and lose one with each incorrect answer, and losing all three prompts the driver to pull over and kick the players out empty-handed.
Title: Cash Cab (Canadian game show)
Content:  A French Canadian version is also aired on V (formerly known as TQS) and is filmed in Montreal. It is known as Taxi Payant (Paying Taxi) and uses a Dodge Grand Caravan. Comedian Alexandre Barrette is the host.
Title: Cash Cab (American game show)
Content:  During Season 6 of Cash Cab, a new spin-off series, Cash Cab: Chicago, hosted by comedian Beth Melewski and using the same rules as its New York counterpart, aired. The spin-off was cancelled after one season, but rerun episodes are aired along with Cash Cab episodes in syndication. Ben Bailey stated that the show was created during contract renewal negotiations.
Title: Crazy Taxi: Catch a Ride
Content:  The main objective for the player is to make as much money as possible as a cab driver. The player selects one of two cities to play in where they maneuver around the city to find passengers for their cab. Players receive money based on; how fun the trip was for the passenger, hitting jumps within the map, driving close to traffic, drifting and how quickly the cab ride is accomplished. Players can choose from four characters, Axel, B.D. Joe, Gena and Gus. In addition to the main game, nine different mini-games are also available for play. The game also features multiple save slots per cartridge, allowing for the player to save their progress through the game.

Question: how does the cash cab guy read the questions?
Answer: walkie-talkie and earpiece.