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I just got an email from Quora asking me to answer a question: "What is the speed limit on roads in the United Kingdom (UK) that have 30 miles per hour signs?"
The gene pool needs a healthy dose of chlorine again ... 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
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OriginalGriff wrote: roads ... that have 30 miles per hour signs
I thought they'd got rid of all of those in Wales[^]? Or have they not changed the signs yet? 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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No, what the Senedd did was change the default speed limit - the one in areas with street lighting unless otherwise signed.
Some of the areas which were signed as 30 have been changed to 20, but many haven't changed and they are still 30 zones.
It's been done quite intelligently round here: the town itself is 20 (and signed as such), but the bypass is 40 when passing houses, 50 the rest of the time (and signed appropriately) with a 30 section round the ASDA roundabout (signed again).
I think it's a bad idea though: it'll increase air pollution as everyone will be in a lower gear, increase prices as deliveries will take longer so there will be fewer per van / truck per day and I doubt it will save lives as it's likely to be largely ignored (just as the 30 limit often is) unless the whole country is blanketed in speed cameras ...
It may even increase accidents and injuries due to the "risk compensation factor" (just like the introduction of compulsory seatbelts caused more deaths as accidents got bigger so donor organs weren't usable when the victims arrived at hospital).
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I don't know about the UK, but I suspect most decisions in the USA regarding speed limits, stop signs, and other traffic controls are based less on driver/pedestrian safety and more on increased revenue from violations.
There are no solutions, only trade-offs. - Thomas Sowell
A day can really slip by when you're deliberately avoiding what you're supposed to do.
- Calvin (Bill Watterson, Calvin & Hobbes)
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The reply could be: "30 kilometers per hour (in most cases)"
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I was gonna say, this is a trick question, as there should be no signs in the UK that should be using mph...
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With a very few exceptions, speed limit signs have a number, and that is all. Unlike foreigners, we all know what they refer to.
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Richard MacCutchan wrote: foreigners
Aren't the US and [some small country whose name I forget] the only countries left in the world that still haven't adopted the metric system?
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Not quite in UK. From https://en.wikipedia.org/wiki/Metrication_in_the_United_Kingdom[^]:
Apart from the sale of fuel, which was metricated in the 1980s, motorists have seen little metrication. Speedometers and mandatory information on car advertisements such as fuel consumption are given in both metric and imperial units. The 1994 TSRGD permitted the use of metric units alongside imperial units for width and height warning signs and dual metric/imperial signs became mandatory from March 2015. Distances and speed restrictions are shown only in imperial units.
(My underscoring)
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We have perfectly good measurement systems of our own, we don't need metrication.
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The only obvious answer is to convert to Kelvin and reply. "The correct speed for this sign is 439 Kelvin".
Hogan
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Well at least in the US far as I can tell on highways the speed limit is actually about 5-10 miles higher than actual posted limit.
Except when you cross from one State to another. Then you should always slow down to 5 miles below the limit.
Actually the first point is not as odd as it sounds since highway speed limits are often set using at least some input as to what speed drivers are actually going. So that means that, on average, some drivers will be going faster (not just the idiots that think the are on a racetrack.)
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They day didn't end yet... where is your pirate talk? 
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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It's dark here - day has ended 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Let's have a week of easy ones
Not good at home time chat (8)
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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BAD not good
IN at home
AGE time
def - chat
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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YAUT 
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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So git yer eyepatches on, strap a Parrot to yer shoulder, and ready the plank!
It be Talk Like A Pirate day agin! Arrr! Jim me lad!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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OriginalGriff wrote: strap a Parrot to yer shoulder
A Norwegian blue?
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Nay, that be a landlubberly arrrror! Beautiful plumage, but ye havta nail them to their perch or they nuzzle up to them thar barrrs, bend 'em aparrrrrt with its beak, and VOOM!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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'Tis good ye're here. Ye'll scare away the rats, ye knee-knockin', lily-livered scalawag! ... Garr!
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"Aha! I can just torrent a cracked copy of that software, rather than having to pay for it!"
Oh, wasn't that the sort of pirate you meant?
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Pour, O pour the pirate sherry;
Fill, O fill the pirate glass;
And, to make us more than merry
Let the pirate bumper pass.
-- Pirates of Penzance
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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At that price, it had better come with flag and cutlasses!
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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