Yes it means danger, ridiculously long web link ahead....:-)

Brian

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"NY" wrote in message
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On Wednesday, 6 May 2020 21:17:54 UTC+1, Brian Gregory wrote:
Does one just look at the map that's available and any key that's with
the map and then one knows what's what?
Not sure what aspect of it would need to be taught?

That's part of what needs to be taught. It might be obvious to you and
me.

Without cheating and looking it up on Google, how many people know what
this symbol is?
https://www.streetmap.co.uk/map.srf?...ay=179145&lm=0 -
the black symbol in the angle between the two motorways.

I happened to come across this symbol which I've never seen before, and it
took several attempts to find an Ordnance Survey Legend web page that
included it.