In message , at
21:33:43 on Mon, 28 Nov 2005, Richard J.
remarked:
So there is the possibility of stretches of 599m of lit road where the
limit is still NSL, without any repeaters being required.

But the guidelines do say that for lit stretches of 600m or more, the
first and last repeaters should be not more than 450m from the
start/end of the lit section, so it would be reasonable to expect at
least one repeater in a lit section of more than 450m.

Yes, if the lit section is more than 600m. Especially if you are new to
the area, you may not know how far the lights go.

However, the guidance is poor in my view. I much prefer the French
practice of often putting several repeater signs close together just
after the start of the limit, which leaves you in no doubt what the
limit is. In Britain, if you miss the initial sign,

Which initial sign is that? We are mainly talking about isolated
stretches of lit road (whether they be thorough a village, or merely
adjacent to a junction) where there's no sign at the start of the lit
section.

you will often drive for 450m before you see a repeater, and for over
1000m if the first repeater is on the right-hand side of the road when
it can be obscured by oncoming traffic.

--
Roland Perry