I regularly pass a (UK) road sign that I don't recognise.

enter image description here

My gut instinct is that it's warning me about a bridge or a tunnel but it's on a normal dual-carriageway and there are no obvious overhead structures for more than a mile, nor are there any side turnings that it seems to relate to.

So what the heck is it and what am I supposed to be looking out for?

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    For the record, it's not in the DVLA "Know your traffic signs" book; – Richard Jul 1 '15 at 21:16
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    After some consideration, I've decided that it's probably a warning sign that people might be turning to come back the other way along the dual carriageway ahead. The presence of an arrow on the right-hand side of the sign shows the (possible) direction of traffic. I've posted a bounty for anyone who can get actual confirmation (e.g. not just speculation) – Richard Feb 23 '19 at 0:50
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    Sure looks like some sort of "U-turn allowed" sign to me. – Daniel R Hicks Feb 23 '19 at 2:40
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    Excellent point raised in flags - what is the relevance of this question to bicycles? Does this sign have relevance to a cycle lane or path? Are bicycles permitted on this road? Argenti's answer suggests it might be a sign found on motorways (A roads), where bicycles are not permitted. – Criggie Feb 23 '19 at 23:38
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    @Criggie - Whoever flagged this is simply incorrect. Cycles are allowed on all UK roads other than motorways. A-roads (which are typically dual carriageways) are not motorways, hence cyclists can use them and must obey the signs found on them. – Richard Feb 23 '19 at 23:51

The 'arch' is actually an arrow - look at the right hand end.

I believe it means there is a junction between the carriageways that allows you to make a right turn and travel along the opposite side.

enter image description here

There's another sign on the other side of the carriageway, and a corresponding u-turn junction.

enter image description here

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  • Although this is likely to be true, I've reserved the bounty for an answer that offers specific confirmation – Richard Feb 23 '19 at 1:04
  • Two photos are about the same place but from opposite directions ? So is the sign warning that a motorist CAN turn here to go the other way, or that the other side of the road has a U turn option here and could appear in the green-middle of the road where there are no joining roads ? – Criggie Feb 23 '19 at 6:55
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    This seems likely tho I can’t verify either. I think the implication is that a car making a u-turn must cross fully through the central reservation to complete the manoeuvre. – Swifty Feb 23 '19 at 12:19
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    It's definitely indicating that this is a place to do U-turns but I can't find any official (or even unofficial) confirmation of that, anywhere. – David Richerby Feb 23 '19 at 19:39
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    I asked an expert on Twitter and got the reply: "This is a non-prescribed road sign showing a U-turn in the central reservation of the A6110. It's modelled on the 1975 contraflow sign but is meaningless to most drivers." twitter.com/ShowMeASignBryn/status/1099595986610073600 – Stephan Matthiesen Feb 24 '19 at 9:19

Looks like a low bridge / arch bridge warning. Strange, they usually have text indicating the minimum height.

enter image description here
(source: ukmotorists.com)

Note that this is a wrong answer but keeping it here so other people can know it’s not a low bridge sign. Feel free to downvote.

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    @RoboKaren fair play, worth keeping - otherwise someone will come along and suggest it's a bridge again lol – Swifty Feb 24 '19 at 21:02
  • Well, I've undone my downvote as I agree that "It's not a low bridge" is a useful answer. – David Richerby Feb 24 '19 at 23:09
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    @DavidRicherby hey, I’m asking you to downvote me. :) – RoboKaren Feb 25 '19 at 2:52

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