great article, ridden in NYC a few times, as believe or not when lived next door went by car hehehehe! parked around 42nd st. no problems for 11 yrs!
Madrid got an overhaul, been riding the metro there since 1972, the UE infusion has been inmense and improvement to boot. Nothing in comparison to the old days. I still rode electric cars in madrid to Canillejas....
Now London, always there on business, by taxi company pays ::) However, this july will be there for my summer vacations with the family and will use the oyster card;so to be seen and talk.
Paris systems done it several times, but again go there by car too most of the time, dont like the idea of traveling 10 meters under ::) However, its recognise as a marvelous system.
cheers