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Originally posted by Martin
Thats what I thought, I remember they did a test somewere to see if it worked and it showed that if everyone was slowed down to 50Mph people actually got where they were going quicker!! Sounds silly but when people swap lanes at higher speeds other drivers tend to brake causing other drivers to hit the break making a chain reaction of delay. They found this didn't happen and delays eased.
I suppose things never work out as they plan with the great british public.
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Yes, it works quite successfully on that stretch of the M25 that is already the most congested road in the UK. The caveat of course is that people have to stick to the variable speed limit. There are speed cameras hidden behind some of the overhead gantries on this stretch of motorway, and it is in these specific applications that I think sophisticated speed detection is completely justified. There should be actively used speed cameras on every gantry within a variable speed limit zone, because if people stick to the limits they really do work.