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#Post#: 62042--------------------------------------------------
Motorway Gantry Cameras - activation.
DIR By: facade
Date: March 12, 2025, 4:26 am
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Just a quick question for confirmation.
When a gantry goes from clear to displaying a speed limit of 40,
the camera doesn't start enforcing 40 for a short while, to give
traffic the chance to slow down safely.
But, if the displayed limit had been 40 for half an hour, and
then raises to 60, does it continue to enforce 40 for the same
delay time?
So traffic that is speeding up gets flashed, but won't be
prosecuted as the confirmation photo will show the 60 displayed,
(or the time logs will show 60 was active)?
#Post#: 62107--------------------------------------------------
Re: Motorway Gantry Cameras - activation.
DIR By: 3phase
Date: March 12, 2025, 9:47 am
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If it's HADECS, then they have the 'money shot' from the cams on
the pole in advance of the gantry showing the limit. So they
would show the 60 as you passed so NFA I'd reckon - even if auto
processed you could prove it was 60 clear as day.
I don't know the specific answer to your Q regarding time delays
though - you'd hope the software was instantaneous going up, a
bit of leeway reducing.
Interesting Q though, as I'm just about to start a new thread
ref. what I saw today with red X on the M1
#Post#: 62168--------------------------------------------------
Re: Motorway Gantry Cameras - activation.
DIR By: facade
Date: March 12, 2025, 2:23 pm
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It came up on Reddit, someone posted a dash cam video of being
flashed as they were speeding up because a gantry went from 50
to 60 as they approached it, but their dashcam shows that they
were under 60 when they were flashed (and the gantry was
displaying 60).
No-one was overtaking/catching them, so it must have been them
that triggered the flash.
I can't think of any other reason for the flash other than a
camera test. (or a fault)
One would expect that as the confirmation photo would show 60 on
the gantry so it shouldn't ever get sent out.
I suppose that technically they are still in a 50 from the
previous sign until they pass the 60 sign and the measurement
could be made before the sign (I thought HADECS cameras were
self contained so the radar faces in the direction of travel
though), but most likely the whole section went to 60 at the
same time including the previous gantry anyway.
It would be an interesting day in Court if the measurement is
behind the gantry to match the photo and they tried to infer
speeding before the gantry from it.
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