BBC Radio Solent tweeted a picture of a road closure (apparently near Winchester):

In the background, there is a road sign with two red lights on and a yellow "symbol". What does it mean?

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    Wild guess: an irrationally slow speed limit of ~3.14mph. – Jules Sep 23 '17 at 23:46
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    Another (crazy) guess is that there is a bridge out ahead. Maybe with a pop-up fence across the road. – wallyk Sep 24 '17 at 1:12
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    That symbol is Stonehenge. The Spinal Tap version. – Harper Sep 24 '17 at 3:45
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    Picnic table crossing. – Kevin Sep 24 '17 at 20:01
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    it's the sad emoticon (TT), because the road is closed – user13267 Sep 25 '17 at 2:35

Looks like a "Temporary lane closure".

The situation in Winchester, you referred to, supports this.

See another example from gov.uk


Temporary lane closure (the number and position of arrows and red bars may be varied according to lanes open and closed)
source: https://www.gov.uk/guidance/the-highway-code/traffic-signs

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    Another version is at gov.uk/guidance/the-highway-code/… under "Motorway signals", but that just shows one lane closed – Dezza Sep 23 '17 at 16:07
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    The sign is indeed showing that there are two lanes and both are closed. Also, the red lights are flashing side-to-side like level-crossing lights; yellow "hazard" warning lights flash top-and-bottom. – Andrew Leach Sep 23 '17 at 16:38
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    As a British driver I can confirm this is the correct answer. – niemiro Sep 23 '17 at 18:27
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    Also a British driver. The verticals are oddly thin but yeah, double lane closure. – Kaithar Sep 24 '17 at 11:42
  • Very odd. Here in Germany, AFAIK, if one of several lanes is closed, there would be an indication by an arrow pointing which lane one should drive on instead, or if all lanes are closed (i. e. the road is closed), one of the icons for "no vehicles"/"no entry" (Zeichen 250 or Zeichen 267) would be used. – Tim Landscheidt Sep 25 '17 at 18:25

It means both lanes closed. It is one of the options for the British motorway variable signs, see the official highway code pages for more details.

Note that the example on the page only shows one lane closed: lane closed, from gov.uk image database

but the descriptive text covers this combination.

The image shown above is Crown Copyright, and can be found in the UK Traffic-sign images collection, with reproduction permitted as detailed on that page. This image is 6009.jpg within the Motorway Signs collection


If I'm correct, that sign appeared on a Northbound Entry slip road (on ramp for US readers) to the M3 motorway to indicate that the entire slip road was closed temporarily. I can't now remember the exact cause but I suspect a major accident. Normally these matrix signs indicate temporary speed limits, single lane closures, etc, but in this case owing to the severe nature of the problem, both lanes of the two-lane road were closed.


Nobody here has commented on the significance of the red lights yet, which are fairly key to the meaning.

The sign is informing that the motorway is closed. The traditional way to do this was to flash the red lights on the sign at the entrance to the motorway, while leaving it otherwise blank; as the picture shows, the red lights around the side of the sign are lit. (It's a still image, so we can't see them flashing, but those lights are never lit steadily.)

There's a difference that can be used to tell apart amber lights (which warn of a hazard) and red lights (which close the motorway and can't be proceeded past): there are four lights of each colour, and for each colour the flashing is done by alternating between lighting two lights and the other two lights, but for amber lights the top two lights alternate with the bottom two lights (flashing "up and down"), and for red lights the left two lights alternate with the right two lights (flashing "left and right"). Even if there's doubt about the colour (cameras and computer screens can cause trouble sometimes), we can easily see that two lights on the same side are lit in the photo, meaning that they must be red.

Now, a "blank sign with red lights flashing around it", especially when it's something as uncommon as a full closure of a motorway or a motorway slip road, has obvious problems with people not knowing what it means. As such, fairly recently, the sign was adjusted to place something on the matrix display as well: this is an "all lanes closed" sign (which is derived from the "various lane closures" sign that @rolinger shows in that answer, but is not the same thing, as it uses red lights rather than amber). The intention was presumably that people who didn't know what the sign for a full motorway closure looks like, but did know what the sign for a lane closure looks like, could figure out the former by analogy with the latter (and it seems to have worked in the case of @rolinger's answer!).

Both the lane-closure and motorway-closure signs are documented in the book Know Your Traffic Signs, which I consulted as a source for writing this answer; in my copy, the amber lane-closed sign is on page 90, and red motorway-closed ("all lanes closed") sign on page 91. There's an annotation next to the latter image:

Do not enter the motorway when the red lamps are flashing in pairs from side to side

As a side note, there are two different sorts of lane closure signs: the T-shaped ones with amber lights are a warning ("the lane will be closed, get out of it"), and there's also a mandatory/legally binding version which uses a red X ("the lane is closed, do not pass this sign in that lane"), together with the traditional red lights. However, only a small proportion of motorway matrix signs are actually physically capable of drawing the red X. As such, on older or smaller signs which don't have an appropriate display, only the T-shaped display is available for both situations, and the warning versus do-not-pass status is specified purely using the colour of the surrounding lights (if it's amber, it's not an emergency if you're in the wrong lane, if it's red, you'd better not be in the closed lane).

In the case where all lanes are closed, though, you don't have any open lanes to move into, and so even people who miss the significance of the colour of the lights (like almost all the discussion in this thread so far seems to have done: only comments by @Bristol and @AndrewLeach point it out) are likely to realise that passing the sign will be a bad idea. So even though the change to add the TT symbol to the sign has caused some amount of confusion between two signs, motorists will still end up doing the right thing (which was presumably the goal of the change in the first place).


You are on, or approaching a dual carriage way (2 lanes of traffic in your direction). and BOTH lanes are closed.

This is re-iterated by the popup sign in the foreground - a red circle with a white line through, which means "No Entry"

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    dual carriage way (2 lanes of traffic in your direction) - a dual carriageway is where the traffic in each direction is separated. It doesn't have to have two lanes in your direction. – Rawling Sep 25 '17 at 8:53
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    @Rawling is correct. You could be on/approaching a two lane one-way street. – AndyT Sep 25 '17 at 14:28
  • @AndyT, yes but not seeing this sign, which shold only be used on Motorways. (I guess you could argue that parts of some UK motorways are effectively 2-lane 1-way streets, like the famous part of the M62 that splits around a farm mirror.co.uk/news/uk-news/house-middle-m62-truth-behind-8145177 but that's a stretch!) – rolinger Sep 26 '17 at 9:15
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    A dual carriageway doesn't have to have two lanes, but the sign indicates that this road does. On the other hand normal British usage is that "dual carriageway" usually implies "dual carriageway which is not a motorway", and this is a motorway. For example, en.wikipedia.org/wiki/… has a column for "dual carriageway"rather than "dual carriageway other than motorways". – armb Sep 26 '17 at 9:47

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