On 27/06/2010 12:15, Graham Harrison wrote:

"E27002" wrote in message
...
On Jun 26, 8:15 am, Basil Jet wrote:
Why are American cities full of open girdered viaducts whereas British
cities are full of brick viaducts?

Availability of materials.

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Might it also be something to do with the very nature of the viaducts?
If you think about the "elevateds" in the US many of them were built
over roads and I'm not sure how practical it would have been to use
brick for that.

I think you've put the cart before the horse. It's not that London
viaducts utilise brick because they are not over roads - they don't have
roads beneath them because they utilise brick.