London’s congestion charge is particularly annoying as (at least when I lived there in 2012-2013) it was very easy to take the wrong turn and be in the zone, not realize you were ever in it (even for a single block) and consequently not pay the fee in advance. If you don’t pay the fee the same day, they send you a bill for like 10x the amount. I found TfL to be a totally corrupt organization that was trying to obfuscate its rules to extract larger fees.