John Rowland wrote:
"Dave Arquati" wrote in message
...

The Government-approved scheme which was scrapped
recently was to build a tunnel at Henlys Corner. Although
much better for local residents than a flyover, it would
have been extremely expensive and that's why the
Mayor dropped it when he published his Transport
Strategy in 2001. Rather than making improvements
just for car users, it seems more appropriate to improve
safety for motorists and pedestrians at the junction
(given that the current footbridges are virtually unused as
pedestrians don't like being relegated to bridges and tunnels).

Where are the footbridges at Henlys?

Incidentally, I have just designed a grade separated junction for
Henlys on the back of an envelope. It's easy - all it needs is two
perpendicular bridges and one somewhat skew bridge to give both the
A1 and the A406 a straight run through. All turns would be allowed,
including A1 w/b to A406 e/b, which is currently banned. Land take
would be small, and gradients would be easy. Whether it could cope
with the traffic flows is another question.

Have you taken into account the topography and the geology?