>> Recent examples include a lane closed sign just left at the side of lane 4
>> with no sign cancelling for the 20 or so miles after and no sign of
>> any works or need for the sign.
When you say left at side of lane 4 do you mean an overhead gantry sign or something metal or plastic on the side of the carriageway?
My own experience of gantries and VSL is pretty good although I wish they'd prosecute people who ignore land closed signs. I've seen Highway Agency staff having to desperately wave offenders out as they bear down on scene of incident.
We were on M25 near A10 yesterday when speed limit gradually dropped to 40 with message 'Report of Accident. Everything ground to a near halt after the tunneled section followed by closure of lanes 1 and 2. On this occasion drivers were actually complying. Though the road was stopped completely for several minutes. Passing site where vehicles had been moved to lane one it looked like a non injury side swipe by a UK/RHD truck to a car on its nearside. Under way at normal speed again with NSL sign and 'End' to confirm.
M20 currently has miles and miles of 50 limit Ashford most of way to M26. Starts with a new junction under construction near Ashford followed by 15 miles or so for Operation Brock; infrastructure to allow contraflow on London bound side while coast bound is used as a lorry park. No sooner are you at end of that then there's another long section for conversion to All Lane Running. We had the caravan on tow so only reduced our speed by 10mph (though improvement in fuel consumption was vary marked). Explained why Google showed such a long section hi-lited orange for slow running.
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