"Basil Jet" wrote in message
...

Apparently a new avoiding slip from M25 E/B to A10 N/B is being
constructed.

https://highwaysengland.co.uk/our-wo...-improvements/

But my question is about what is (or was) there before the work. For years
there has been a weird lay-by on the northbound A10 just north of the M25,
weird because you can only get into it by stopping on the dual carriageway
at the end and reversing in. There are usually lorries parked in the
cul-de-sac part, usually placed so that you would struggle to reverse a
normal car past them, even if you weren't worried about cars on the dual
carriageway crashing as you reversed. What is this? Was it originally
built as part of an earlier plan to build an avoiding slip that got
cancelled? Was it originally a normal lay-by whose entrance somehow got
obliterated?

Looking at some old maps online it's not completely out of order for it to
be a remnant of the A10 from before the M25 was built. Also, J24-25 opened
over two years before J25-27 so it could be the remains of a temporary
junction.

This kind of thing is quite common; here is a slip road on the A23 that was
built but never opened to traffic:



--
DAS