The roads in Hampstead where I live are too narrow for two cars to pass in opposite directions, but are not made one-way, which is a prescription for gridlock,

The roads in Hampstead where I live are too narrow for two cars to pass in opposite directions, but are not made one-way, which is a prescription for gridlock, and this is hardly central. Then you have blocks like this one in Belsize Park that is nearly a kilometer long and and an impassable obstacle to traffic flowing NW—>SE towards Central London: https://i.redd.it/m41b4ibr3jn81.png https://i.redd.it/m41b4ibr3jn81.png