Unassuming people enter the "Cash Cab" as simple passengers taking a normal taxi ride, only to be shocked when they discover that they're instant contestants on Discovery Channel's innovative game show!

Ben Bailey, the host and driver of Cash Cab, then offers them the following proposition:

The Cash Cab will drive you all the way to your destination and ask you general knowledge questions along the way. The questions start out on the easy side, then get harder along the way - the harder the question, the more money it's worth. The first four questions are worth $25 for each correct answer. The next four are worth $50 and then every question after that is worth $100.