NEIL JEFFREYS wrote:
I have heard much about these speed activated warning signs, are there any in this country?
I remember seeing a very basic one years ago in south London. I'm not sure if I was even driving back then, must have been a good fifteen years back. I can't remember what message it gave or how sensitive it was, and it's long since been removed so I imagine it was experimental. I'm sure it didn't resemble modern smiley sids much.
I think the new ones exist in a few types. I haven't seen any of the speed limit reminder variety myself, but I've heard of them. However, in Hampshire between the M3 and Alton (can't remember the road number) I recently saw a few flashing up to warn of sharp bends ahead. Hat off to whoever put those up. They must have been speed activated since I didn't set any of 'em off

, but then I was forewarned by someone else setting it off ahead of me. What they did do was give a clear warning of a specific hazard to anyone at an inappropriate speed. You could see it working from the brake lights coming on right after it lit up. Coming back I noticed they they seemed to be solar powered, so I reckon they're probably dirt cheap to run as well. And for those going slowly enough not to set it off it's a lot less obtrusive than a Gatso. In fact, since they warn of a hazard rather than a speed limit they probably don't even prompt the usual must-check-the-speedo response that Gatsos provoke among so many motorists. I expect most would simply lift off and/or apply light braking. IMO much better even than the limit reminder types. I'll have to see if I can find a picture as i don't think I've described it well.
Now why can't TPTB stick up 5 or 6 thousand of these?
Edit: Couldn't find a picture on the web, but I did find a couple of interesting PDFs:
http://www.southglos.gov.uk/acrobat/roadSafety/VASReport.pdf
http://www.trl.co.uk/static/dtlr/pdfs/TRL548.pdf
The TRL one has a photo (plate 3) of a sign very similar to the ones I saw near Alton.
Another edit:
Guess this would be one of the garden variety speed limit reminder sids. Somewhere in Norfolk, apparently. Can't see how giving half a dozen Dodgyscopes (TM)

to some retired locals is going to have a better effect than these.