Sorry, I realised I'd replied twice to the same comment, so I merged my replies together. Your original assertion was that London's congestion charge area is t

Sorry, I realised I'd replied twice to the same comment, so I merged my replies together. Your original assertion was that London's congestion charge area is trivial (small) compared to NYC's. My main point was that it's not: they're actually about the same size. London's is also not trivial to implement: London's street network is pretty complex, and I'd be very surprised if there aren't many more entry/exit points to the London congestion zone compared to Manhattan's, which has the significant benefit of being on an island! I'm not sure how "proportion of size compared to the rest of the city" is relevant. In both cases they're the most central, busiest parts of their respective cities, with the most commuters and the worst congestion. You're right that London's central zone is geographically tiny compared to the Greater London area. The NYC congestion zone is also tiny compared to the New York metropolitan area, which is enormous.