"Michael Bell" wrote in message
...
In article , tim

But this isn't why [M25 between A3 and M4] is like that.

It is because when they widened to 4 lanes it was too
expensive to rebuild the junction so the extra lane
was only built between the junctions. As you say it
works well, but I don't think that they
often do it that way by design.

The motorways in Washington New Town (was County Durham,
now Tyne & Wear) are all like that. It is obviously planned like that.
It works well, as it should.

I believe that the North Circular was planned and built like that from Hale
End Rd to Palmers Green, and I know that the scrapped plan for Palmers Green
to Bound Green Road inclusive was also like that (2+2 lanes through
junctions and 3+3 between them).

--
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