John Wright wrote:
Roland Perry wrote:
In message , at 11:45:29 on Sun,
17 Aug 2008, JNugent remarked:
I am not aware of any other significant highway building inside the
M25 (whether inside or outside London) in the last 20 years, let
alone 10.

If you expand the horizon to 20 years, then that brings into scope
the Limehouse Link (and obviously a whole bunch of local roads in
Docklands - but let's not get in a wrangle about how "significant"
they are). Also my 1988 map doesn't have the A12 extension through Leyton
down
to Stratford, but I forget exactly when that opened.

On the other side of London they widened the A40, including the
stretch past Hillingdon, in the early 90's (the slightly relocated
station opened in 1992).

And I expect some of the widening of the North Circular was still
taking place in that timeframe too.

If you allow 20 years theres the series of underpasses along the A40
which abolished (amongst others) the notorious Hanger Lane Gyratory
system. This went on at more or less the same time as the widening. I
think that's less than 20 years ago.

The Hanger Lane underpass long predates the gyratory which sits on top of
it. The underpass is shown on a very early 60s A-Z map of London.

Brimstone wrote:
John Wright wrote:
Roland Perry wrote:
In message , at 11:45:29 on Sun,
17 Aug 2008, JNugent remarked:
I am not aware of any other significant highway building inside the
M25 (whether inside or outside London) in the last 20 years, let
alone 10.
If you expand the horizon to 20 years, then that brings into scope
the Limehouse Link (and obviously a whole bunch of local roads in
Docklands - but let's not get in a wrangle about how "significant"
they are). Also my 1988 map doesn't have the A12 extension through Leyton
down
to Stratford, but I forget exactly when that opened.

On the other side of London they widened the A40, including the
stretch past Hillingdon, in the early 90's (the slightly relocated
station opened in 1992).

And I expect some of the widening of the North Circular was still
taking place in that timeframe too.
If you allow 20 years theres the series of underpasses along the A40
which abolished (amongst others) the notorious Hanger Lane Gyratory
system. This went on at more or less the same time as the widening. I
think that's less than 20 years ago.

The Hanger Lane underpass long predates the gyratory which sits on top of
it. The underpass is shown on a very early 60s A-Z map of London.

Yes, you are right - my memory of this is faulty not having lived in the
area for some time.


--
John Wright

"What would happen if you eliminated the autism genes from the gene pool?

You would have a bunch of people standing around in a cave, chatting and
socialising and not getting anything done!" - Professor Temple Grandin

Brimstone wrote:

The Hanger Lane underpass long predates the gyratory which sits on
top of it. The underpass is shown on a very early 60s A-Z map of
London.

Was it lengthened when the gyratory was put in? It seems too long to have
been built just to go under a crossroads.

John Rowland wrote:
Brimstone wrote:

The Hanger Lane underpass long predates the gyratory which sits on
top of it. The underpass is shown on a very early 60s A-Z map of
London.

Was it lengthened when the gyratory was put in? It seems too long to
have been built just to go under a crossroads.

Nope, it is as it has always been. If you look at a plan view of the
gyratory, you'll see that it is to the north of the A40 and its underpass.
Even before the gyratory was built, the junction was a large one.

John Rowland wrote:

Brimstone wrote:

The Hanger Lane underpass long predates the gyratory which sits on
top of it. The underpass is shown on a very early 60s A-Z map of
London.

Was it lengthened when the gyratory was put in? It seems too long to have
been built just to go under a crossroads.

It is as long as it is due to the need for its depth to be greater than
normal because it passes under "the built environment" (ie, it is more
of a tunnel than a cut and cover underpass) and because of the need to
keep the approach gradients as low as possible.