Speed limit East Dulwich Grove

[malumbu]

They race to it and then slow down, pretty pointless wouldn't you say, it would be nice if you agreed with one of my points one of these days.

[first mate]

I would say, once drivers are wise to a camera the same is true all over. Cameras probably only catch out drivers who are unaware or where they are obscured. The way round that would be to keep changing where the cameras are, but doubt that is technically possible. I am all for fining drivers who wantonly speed on a regular basis. Everyone sometimes slips over the limit by a bit.

[Penguin68]

There are specific rules about where and when speed cameras are allowed, based around the number of incidents - and their seriousness (and they have to have been identified as being caused by excess speed)  and the %age of people travelling over the permitted maximum speed (85% I believe). They can't (or shouldn't) be randomly plonked down or moved. Some speed indicators are advisory, not statutory.

[malumbu]

Advisory vs  mandatory 20 mph would appear to be an urban myth, for example on GB news.  A nice article on 20 mph on a random website  https://www.carwow.co.uk/blog/are-20mph-speed-limits enforceable#gref

This includes comments on a DfT metastudy that I saw a few years ago which showed disappointingly 20mph aren't having a massive impact on average speeds in urban area.

Some numbers from GLA, around a quarter of a million prosecutions over five months in 2022 for speeding of which over a 100,000 were 20mph zones, so quite a few of us are being prosecuted.  Not clear how many were fixed penalties, points or speed awareness courses.  I'm surprised how many people I know who have done the latter.

It would have helped if DfT had actually clarified whether 20mph was enforceable (which looks a very big yes).

 

[OutOfFocus]

13 hours ago, Penguin68 said:

They can't (or shouldn't) be randomly plonked down or moved. Some speed indicators are advisory, not statutory.

They SHOULD be placed randomly IMHO.  Otherwise people slow down for them.

[Penguin68]

16 hours ago, malumbu said:

Advisory vs  mandatory 20 mph would appear to be an urban myth, for example on GB news. 

I think you'll find that advisory speed limit notifications are a thing

https://www.carbuyer.co.uk/tips-and-advice/166095/what-is-the-national-speed-limit#:~:text=The ones that flash in,enforceable speed limits per se.

[Penguin68]

11 hours ago, OutOfFocus said:

They SHOULD be placed randomly IMHO.  Otherwise people slow down for them.

Actually, I believe there are specific rules about placement of fixed speed cameras - which must be properly signed and visible and can only be placed where there have been RTAs where excessive speed has been a contributory factor and/ or I think where 85% of passing traffic is travelling over the statutory limit for the road section. They are there to discourage speeding as a safety measure, not specifically to catch speeding motorists as a revenue generator (which would very much be our council's choice, I'm guessing). People slowing down (in 'dangerous' spots) is their precise aim.