Roland Perry typed:
In message , at 17:50:32
on Mon, 28 Nov 2005, Dr Ivan D. Reid
remarked:
ps Does anyone have a link to the current version of the document
where things like the "500m" above are defined?

"You MUST NOT exceed the maximum speed limits for the road and for
your vehicle (see the table below). Street lights usually mean that
there is a 30 mph speed limit unless there are signs showing another
limit.

The ABD page: http://www.abd.org.uk/speed_limit_signs.htm provided
elsewhere in this thread has the distances to which I refer. It's
quite complex, and also mentions the "200 yds" distance which makes a
street officially "lit".

Assuming that it's not almost entirely written with cul-de-sacs in
mind, I assume that when they refer to (eg) "Lit road more than 600m
in length on which the national speed limit applies" that what they
really mean is "Road with more than 600m of it lit ..."

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.

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, 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.
--
Richard J.
(to e-mail me, swap uk and yon in address)