Adrian wrote:

Hmmm. I'd say that London had a higher proportion of expensive areas on
main arteries than other cities, with a higher proportion of the poorer
population commuting in from outside.

Most of the major arteries go through bloody well-off areas.

Really? I live in Hackney, which is mostly not very well off. Then look at
Tower Hamlets, Islington, Newham, Haringey, Southwark, Lambeth, Brent...
I'd say that the more of the traffic burden in terms of pollution, noise
and accidents falls on poorer inner city areas, and children and older
people who use the streets more are the most affected.

E.