On 24/11/2017 23:33, James Wilkinson Sword wrote:
On Fri, 24 Nov 2017 22:43:30 -0000, Roger Hayter wrote:
James Wilkinson Sword wrote:
On Fri, 17 Nov 2017 19:08:10 -0000, Murmansk
wrote:

On the A55 in North Wales near LLandudno and Colwyn Bay there are
stretches where it has a 50mph speed limit and that's shown by a
conventional circular sign with 50 written on it in a red circle with a
white background.

What puzzles me is that when the 50 limit ends instead of there
being a
National Speed Limit Applies sign (white circle with a black sloping
bar
through it) they have a 70 sign in the same style as the 50 sign.

Is there any specific reason for this? It occurred to me that it MIGHT
have something to do with that road being used by foreign lorry drivers
coming from Holyhead?

They should all just have the speed limit, like they do in France.
What's
the point in having an NSL sign?

For some years there was no national speed limit and the signs meant
"derestricted".** They didn't want to change all the signs when they
brought in the national speed limit.

But they might aswell put in the proper number when they put up new
ones.* They change limits so bloody often (100 times more often than the
national limit), so they might aswell.

The meaning of the "derestriction" sign varies - I think it's 70 for
dual carriageways and 60 for single. Also sometimes they change the
meaning temporarily, such as in the 70s when it meant 50 mph (I think)
for a while when fuel was in short supply.

--
Max Demian