Taxi 4 is a French movie, written by Luc Besson (better known for The Fifth Element) and of course is a sequel to the three Taxi movies before it. There was an American remake done, also called Taxi, but it wasn't as good as the original French one (as is usually the case, except for True Lies, which was a really good remake of La Totale!).
The franchise is starting to show some fatigue, but I still liked it, with enough new ideas to keep it interesting. There's less car chases and crashes and that may be a mistake, because that's what really shined in the first one. Not everyone will like this movie, but I had a good time.