Lane closure bafflement

Lane closure bafflement

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Simpo Two

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88,630 posts

278 months

Thursday
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Coming back from Portsmouth two days ago we ran into the A3/M25 junction which looked like the Luftwaffe had bombed the entire area. We deduced the slip to M25(N) had been closed at 10pm, as when we left Portsmouth around 9.30pm the satnav (with live traffic) initially routed us clockwise, but later changed to anticlockwise. But getting from the A3 to the M25(S) proved almost impossible; the slip road was coned off so we had to double-back and eventually made our way to the M25 via Esher at Leatherhead. It was a damning contrast to the French peages we'd just used to get to the south of France and back.

That was bad enough, but my question is about the rest of the journey. The time was 11pm-midnight so not much traffic about, but the M25 to the Dartford Tunnel contained several sections of several miles where all but one lane was closed and a temp speed limit of 50, 40 and even 30mph imposed. The coned off lanes were empty. Can anyone explain this?