"Michael Bell" wrote in message
...

There certainly are problems in that direction, but
problems are not necessarily insoluble problems.
There would be no problem in running such a way
across the concourse of big stations, they already
have foot walkways over some! Likewise, there
would be little problem adding them to the side of
bridges - the weight is trivial. In many kinds of
modern developments, they could be fitted in.
Streets are a problem, the two main possibilities
are to build them into the buildings at basement
level or at 1st floor level. The objections should
not be too serious - building owners want people
to be brought to their buildings!

But they don't want people carrying bombs brought through their basements.

--
John Rowland - Spamtrapped
Transport Plans for the London Area, updated 2001
http://www.geocities.com/Athens/Acro...69/tpftla.html
A man's vehicle is a symbol of his manhood.
That's why my vehicle's the Piccadilly Line -
It's the size of a county and it comes every two and a half minutes