Yes, Cash Cab New York City is the proper name, Quiz Taxi is the German version. I forgot, sorry.
I don't quite understand why I'm watching this. As I said, its basically always the same, just with different people and different questions. Some of which I don't have a clue about, because they are very specifically American. And yet its kinda interesting to see how the people do in the game.
In general, I don't watch game shows. With very few exceptions may be. There was one on German TV some time ago called "The Thingy from the Roof", perhaps you had a American version, too. It was a weird concept: people would send some item to the TV station, and a group of celebrities in the studio had to guess what these items are, what its used for ect. Sounds simple, but you wouldn't believe what strange items there are - especially if they are a bit older. That was quite interesting, to guess what it is myself, rather than watching what they guess.