"John Rowland" wrote in message ...

Perhaps there was some more curvature in this stretch
of the Roman road, but it's hard to guess how much,

Why guess, when you can go dip-spotting? ;-)

Interesting thread, although it seems just a little too neat & tidy to
me - some of those photos on the site don't show obvious dips and one
(Brick Street) doesn't show a dip at all - just a very sharp brow of
the hill (or the side of an embankment). I wonder if exploring a
number of London streets linked only by a random line of an equal
length would not reveal subsidence in an similar number of locations?
I'm not saying the theory is wrong - just a healthy dose of
scepticism, to prove it would probably need excavation of a fair
number of these sites.