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With regard to dual carriageways, dual carriageway does not mean 2 lanes in each direction, it means 2 divided carriageways separated by a barrier or a verge.
You could have 1, 2 3, or 10 lanes on each side and it would be a dual carriageway.
Ask a few too many questions and make the course over run by 10 minutes then sit back in amazement at how many people speed out of the car park on their phones.
OK, this seems like a place to ask, (was going to say sensible place, but...)
On the Deeside Industrial Park, (Welsh Deeside, not Scottish) there are at least 3 huge, but temporary 50MPH signs with a black border instead of red. The NSL repeaters on the lamp posts aren't covered up.
Advisory speed limit, or a warning of a lower limit further on? By further on I mean about 3 miles, a couple of massive roundabouts and a major road bridge. This is way outside the limit that any traffic backing up to the speed restriction would reach.
I'd guess "mandatory limit which is technically unenforceable due to incorrect signage."
@edlong - a lot of people mistakenly assume that the "dual" bit refers to there usually being two lanes in each direction rather than two separate carriageways (with unspecified number of lanes) that just happen to be going in opposite directions.
The OP is right though - if I saw the NSL sign I would assume that the speed limit is the national speed limit, and if I was in a built up area (<span class="ILfuVd yZ8quc">a settled area identified by the presence of <b>street lights</b></span>), then the NSL is 30.
From my speed awareness course:
Can you roll an orange across the road.? If no, it’s a dual carriageway.
My understanding is that there is never an unannounced change of speed limit.
it will always be marked by a large sign. But for a change to a 30 zone there will probably be no small repeater signs after the initial sign if there are street lights.
Not read past page 1 of the thread..
BUA, as indicated by the presence of streetlamps = always a 30 unless signed differently. If different, repeaters are required. Doesn't matter if single or dual carriageway, the same rule applies.
Rural road with no streetlamps = always a NSL (white sign with black diagonal) unless signed differently. If different, repeaters are required.
NSL = 60 on single carriageway or 70 on dual for cars and motorcycles.
Umpteen variations based on vehicle class / towing.
Simples!
My understanding is that there is never an unannounced change of speed limit. it will always be marked by a large sign.
I agree if you mean a specific limit. But if the NSL applies, the effective limit will change from 70 to 60 if you go from dual to single carriageway, and there will be no speed sign, and possibly (?) no sign for the end of the dual a carriageway.
But for a change to a 30 zone there will probably be no small repeater signs after the initial sign if there are street lights.
I've never seen 30mph repeaters, nor a 30 limit with no street lights.
BUA, as indicated by the presence of streetlamps = always a 30 unless signed differently. If different, repeaters are required. Doesn’t matter if single or dual carriageway, the same rule applies.
Rural road with no streetlamps = always a NSL (white sign with black diagonal) unless signed differently. If different, repeaters are required.
There's at least one village round here where the 30 limit extends a long way past the houses (doubt there are any street lamps in the village either). I've not measured it but its a lot more than the repeater distance for 20's.
I did mean to query it at the time as its on one of the motorcycle test routes.
There is probably a good reason for it like a farm entrance, I just wondered what the technical requirements for 30mph repeaters were.
Well, the course was pretty good actually. Lots of stuff made me think! Especially the bit about how speed limits are only changed (reduced) on roads where stats show that the existing limits mean more accidents. I swore blind where I was caught wasn't at all dangerous, but I guess it's 30 for a reason.
also made me think about my passengers and how shit it is for them to be driven by such a **** (it's not often cos, for good reason, I don't drive much). So, hopefully, I can improve on that front.
and the dual carriageway/ national speed limit was very clearly explained- a lot of the people on the course saying they'd learned something useful in that regard.
Biggest surprise for me was the lack of arseholes in the room and (after what other people have said) the absence of cyclist hatred.
//thread 😉