JT wrote:
Actually I don't think the HC is wrong. If the street lights were spaced too far apart then it would be possible for their to be street lights with no repeaters yet no 30 limit. Bearing this in mind the wording of "usually" seems about spot on to me.
NO !!!!
This wording would be OK,
if you don't then tell people that the presence of street lights automatically means a 30 limit and that they can be prosecuted for going above this limit. As GUIDANCE ONLY, it would be reasonable, but it's not, i.e. if there
were repeaters in a 30 mph limit, then this would be OK, because the 30 repeaters would tell you what the actual speed limit was, and perhaps the street lamps could be put to an alternative use of helping people to see.
I
hope that the new version of the HC will say something like:
Street lamps
always mean that a 30 mph speed limit applies
unless:
(a) There are signs that indicate otherwise, [placed at a distance of not more than 600 yards apart];
(b) The streetlamps are more than 200 yards apart;
(c) The streetlamps are less than 13 ft in height; or
(d) The streetlamps are more than 50 yards apart, and less than 20ft in height
There would still be some confusion, but at least this would make it a bit clearer.
JT wrote:
Interesting point about the combined repeater / camera signs and mobile cameras. Can anyone point me at a statute for this, as IIRC there are several in Kendal which only ever has mobile enforcement by CSCP.
Shhhh! Don't tell them! The more 30 mph speed limit repeater signs that are up, the better. I've seen several 'illegals', and I think they're great !!!!
I also drove through a village just outside of Chesterfield a few weeks back. No street lamps, so 30 mph repeaters every few hundred yards. Guess what -
everyone was doing 30 mph or less!!!

It was
far more effective at getting people to drive at the speed limit than a Gatso or Talivan would have been.
I believe the requirements for repeaters etc. are in the traffic signs regs and general directions, but I'll have to check.
Edit note: Yes, it is in the TSRGD, 2002
Quote:
32. - (1) The sign shown in diagram 878 or 879 may be placed only in an area or along a route where enforcement cameras are from time to time in use.
(2) The sign shown in diagram 880 may be placed only -
(a) on or near a road on which there is provided a system of carriageway lighting furnished by means of lamps placed not more than 183 metres apart in England and Wales or 185 metres apart in Scotland and which is subject to a speed limit of 30 mph; and
(b) not more than one kilometre from a site at which an enforcement camera has been installed and is from time to time in use, and
not more than one such sign may be so placed on each approach to that site.
Sign 880

is the one under discussion, and you can see there are strict limitations, including that the camera must be installed (i.e. a fixed camera, not mobile).