Check out the new diagonal crossing at Oxford Circus in London. It looks beautiful. They based the design on the Shibuya Crossing in Tokyo (which can be great fun if you've never experienced it: here and here). The first time I navigated the Shibuya intersection I thought I was going to get run over flat by waves of people weaving their way toward me from multiple directions, but it's actually a remarkably efficient way to move masses of people. I've never been to London, so I don't know what it's like walking around the city. It'll be interesting to see how the British like this change.