Having known people sent on speed awareness courses because they were clocked on a smart motorway, despite believing they were obeying the limit, a device like this is valuable to avoid that scenario. But only if it works!
If it's got an explicitly signed 30 limit, then the lamp-posts are irrelevant.
Roland Perry snipped-for-privacy@perry.co.uk> wrote
You don't.
let alone to accelerate (against
You are always free to be below the speed limit so that is a furphy.
In message <ToGdnSG5BJqHR6X8nZ2dnUU78R snipped-for-privacy@giganews.com, at 16:43:21 on Wed, 8 Sep 2021, nightjar snipped-for-privacy@bignell.me.uk> remarked:
There's a huge variety of them (even more that conversion to LED is progressing).
In rural areas there are many poles that carry both mains and phones, sometimes with only dropwires (and not the sort where the mains and/or phones wires are daisy -chained from one to the next). I'm sure I've seen poles where both the supply to a lamp [and only a lamp], and the phone cables, emerge from the ground and run up.
Yes, they are mounted on buildings sometimes, although with many pavements obstructed by lamp-posts too, it's not clear this is the main reason.
I'm pretty sure that when the lamp on the right was being converted to LED recently, Plan-A was a pole in the pavement, which they later took away.
In message snipped-for-privacy@mid.individual.net>, at 15:14:17 on Thu, 9 Sep
2021, Alex snipped-for-privacy@hotmail.com remarked:Tell that to the HGV driver who is so close behind, all I can see is his radiator grille.
And with speed limits also applying at noon on a sunny summer day, who's to know if the lamps are working, or not?
And mine works particularly well on smart motorways. The overhead signs are cleraly visible, and despite their different appearance they are recognised reliably.
In message snipped-for-privacy@mid.individual.net>, at 05:52:04 on Thu, 9 Sep
2021, Bob Eager snipped-for-privacy@eager.cx remarked:I'm sure it'll work most of the time, but have you experienced the result of a sign changing when you are about a car-length away from it?
It could be changing up, down, or off.
Would it recognise this as a dual carriageway?
The southbound carriageway is 500m to the right, but it's a moot question since it has signs for a 50mph limit.
Regulations prohibit running mains electricity on the telegraph poles. So, any pole you see carrying electricity, with or without telephone wires, will be the heavier electricity pole. It is a distinction that is probably not immediately obvious.
There has to be at least three lamp posts to form the requisite 'system of street lights'.
As does the railway bridge - even now.
Probably not! But there are always edge cases, and at least it fails 'slow'.
There is a road near me where a slip road goes off at a ney oblique angle, and it 'sees' a speed limit sign on the slip road.
If I'm that close, and it's on a gantry, I wouldn't see it either.
Similar in Nottingham, if you swivel left and right from here
within the centre grass strip are lamposts with (30) on them for the speed camera on the main road and (20) on them intended for the service road.
Scrotes may have removed or spun round some of the repeaters on the posts
Mine sees the limit signs on the back of trucks. And will happily report that the speed limit is 90mph.
As people have already said, if the sign changes just as you are reaching the gantry, you may catch sight of it while it has already passed out of the car's field of view. Or you might spot a temporary sign, partly obscured by a hedge, that the cameras are unable to make out. Fixed signs are most likely in a GPS database as well as visually spotted. Failure rate should therefore be very low - it will not be zero, but then neither is it for driver observation. The system is a driver aid, not to take over from drivers.
And as I've said elsewhere, there is a built in time delay on down. If it goes up or off, the worst that happens is that you don't notice until the next gantry and realise that you can speed up. If it goes down, there time delay prevents it registering you speeding, until you pass the next gantry, which you will be able to see.
Not when they're buried in a hedge and lampposts are the first sign of a possible 30 limit.
Tim Streater snipped-for-privacy@greenbee.net wrote
Which manufacturer is that and what year is your vehicle ?
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.