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From: McKevvy on 16 May 2010 07:18
On 16 May, 11:06, Nick Finnigan <n...(a)genie.co.uk> wrote:
> Derek C wrote:
> > A lot of roads in my area (West Hertfordshire, Buckinghamshire and
> > Berkshire) have recently been fitted with electronic speed limit signs
> > that light up as you drive towards them.
>
>   What sort of signs do you mean? 'SLOW' or Scowly faces that show your
> speed or genuine speed limit terminal/repeater signs which only illuminate
> at night when there is something driving towards them?

I like the scowly/smiley face one - I think that that is more
effective than the Big Brother means of speed limiting.

McK.
From: Peter Parry on 16 May 2010 10:45
On Sat, 15 May 2010 16:14:02 -0700 (PDT), Derek C
<del.copeland(a)tiscali.co.uk> wrote:

>However I have noticed that
>they still light up even if you approach them at well below the speed
>limit, so I guess they don't actually monitor the speed of the
>vehicle. Does anyone know if this is a correct assumption?

They do monitor speed but the radar module used is fairly simple to
keep cost down and not particularly accurate. As with car
speedometers they are set so they will _always_ warn you if you are
above the limit so if their accuracy is say +/- 5mph then they will be
set to trigger at 55MPH for a 60MPH limit and will alert you at a
speed somewhere between 50 and 60 MPH depending upon the individual
module error.

From: Adrian on 17 May 2010 06:54
Derek C <del.copeland(a)tiscali.co.uk> gurgled happily, sounding much like
they were saying:

> A lot of roads in my area (West Hertfordshire, Buckinghamshire and
> Berkshire) have recently been fitted with electronic speed limit signs
> that light up as you drive towards them.

Same area as me - and I've not seen any of 'em.
From: ARWadsworth on 17 May 2010 12:07

"Peter Parry" <peter(a)wpp.ltd.uk> wrote in message
news:fs00v51cghs7osnb5udf359aleg2vh21c9(a)4ax.com...
> On Sat, 15 May 2010 16:14:02 -0700 (PDT), Derek C
> <del.copeland(a)tiscali.co.uk> wrote:
>
>>However I have noticed that
>>they still light up even if you approach them at well below the speed
>>limit, so I guess they don't actually monitor the speed of the
>>vehicle. Does anyone know if this is a correct assumption?
>
> They do monitor speed but the radar module used is fairly simple to
> keep cost down and not particularly accurate. As with car
> speedometers they are set so they will _always_ warn you if you are
> above the limit so if their accuracy is say +/- 5mph then they will be
> set to trigger at 55MPH for a 60MPH limit and will alert you at a
> speed somewhere between 50 and 60 MPH depending upon the individual
> module error.

I passed one today. My speedo said 31MPH, my SatNav said 30MPH and the sign
lit up in green saying 26MPH. I speeded up and the sign flashed a red 31MPH
at me when I reached 34MPH on the Sat Nav display!

Adam


From: Stephen Bagwell on 17 May 2010 18:51
On 17 May, 17:07, "ARWadsworth" <adamwadswo...(a)blueyonder.co.uk>
wrote:
> "Peter Parry" <pe...(a)wpp.ltd.uk> wrote in message
>
> news:fs00v51cghs7osnb5udf359aleg2vh21c9(a)4ax.com...
>
> > On Sat, 15 May 2010 16:14:02 -0700 (PDT), Derek C
> > <del.copel...(a)tiscali.co.uk> wrote:
>
> >>However I have noticed that
> >>they still light up even if you approach them at well below the speed
> >>limit, so I guess they don't actually monitor the speed of the
> >>vehicle. Does anyone know if this is a correct assumption?
>
> > They do monitor speed but the radar module used is fairly simple to
> > keep cost down and not particularly accurate.  As with car
> > speedometers they are set so they will _always_ warn you if you are
> > above the limit so if their accuracy is say +/- 5mph then they will be
> > set to trigger at 55MPH for a 60MPH limit and will alert you at a
> > speed somewhere between 50 and 60 MPH depending upon the individual
> > module error.
>
> I passed one today. My speedo said 31MPH, my SatNav said 30MPH and the sign
> lit up in green saying 26MPH. I speeded up and the sign flashed a red 31MPH
> at me when I reached 34MPH on the Sat Nav display!
>
> Adam

There are some near me, Bury, Greater Manchester

One shows your speed - says 30 when my speedo says 31 and the number
flashes if anyone goes above 30

Others flash a red circle with 30 in the middle which then becomes a
speed camera sign
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