In message , Roland
Perry writes
There are many places on roads where NSL applies, and upon which you
can encounter isolated junctions with street lighting (it often happens
where an unlit bypass has a junction with the "old" road through a
village). But they rarely trigger an automatic 30mph limit for that
short stretch of the road.

That's an aspect which still has me confused, and I've seen a good many
more of these recently. I agree that they are rarely marked with
explicit 30 mph limits, but if there are two or more street lights with
less than 200 yards separating them, doesn't that mean that they
automatically impose a 30 mph limit? It sounds as if you think not,
but I'd be grateful for a fuller explanation of why you think that.


--
Clive Page

In message , at 23:30:26 on Mon, 28
Nov 2005, Clive Page remarked:
In message , Roland
Perry writes
There are many places on roads where NSL applies, and upon which you
can encounter isolated junctions with street lighting (it often
happens where an unlit bypass has a junction with the "old" road
through a village). But they rarely trigger an automatic 30mph limit
for that short stretch of the road.

That's an aspect which still has me confused, and I've seen a good many
more of these recently. I agree that they are rarely marked with
explicit 30 mph limits, but if there are two or more street lights with
less than 200 yards separating them, doesn't that mean that they
automatically impose a 30 mph limit? It sounds as if you think not,
but I'd be grateful for a fuller explanation of why you think that.

Looking at the rules as expressed on the ABD site - and assuming the
lamps are close enough together (200yds) to make the road officially
"lit":

http://www.abd.org.uk/speed_limit_signs.htm

If the lit section is less than 350m (and the speed limit either side is
40 or NSL), then no repeaters are required. This is difficult to unpick.
However, from the general tone of the rules I believe that it's correct
to assume that such a stretch of road has "missing" 40/NSL repeaters,
rather than "missing" 30mph signs.

Similarly if the lit section is less than 450m, and the road either side
has a 50mph limit. (Very few roads have explicit 60mph limits, so let's
not worry about that one).

On the other hand:

If the lit section of road is between 350m and 600m long, and has NSL
either side, then one would expect to find a "derestricted" repeater in
the first 250m. The lack of such a repeater would imply the road is
30mph.

If the lit section of road is over 600m long, and has NSL either side,
the first repeater must be within 450m. The lack of such a repeater
would imply the road is 30mph.

[And similar rules for the last two for 40mph, 50mph and 60mph roads].
--
Roland Perry