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07/9/2009 at 6:53pm
Location: Cornwall Outfit: Autotrail Scout
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Quote: Originally posted by LegsDownKettleOn on 07/9/2009
There was a thread on here a few years ago where someone was defending this sort of behaviour because it meant the roads were less conjested. He had a theory that the more cars you could get on a mile of road travelling at a given speed meant the roads were less conjested.
Unfortunately, the authorities implicitly use this theory on the M25, M42, and anywhere else they've put in variable speed limits. The stated goal is to smooth traffic flow by restricting the speed so that everyone travels at the same speed. However, as soon as that happens the gaps start to close and you usually see mile after mile of cars all doing 40, 50, or whatever the current limit is with a car-length or less between each other. The crazy thing is that when everyone obeys the two-second rule, the faster the speed the higher the capacity (i.e. the more vehicles per minute will pass a fixed point), and so reducing the speed limit can only worsen congestion in theory. However, the authorities know the gaps will close and rely on that happening.
As with all systems susceptible to failure, the longer you manage to put off that failure the more catastrophic the eventual failure is. This is why (IMO) whenever there's a crash in an active variable speed limit section it's almost always a multi-vehicle pile-up.
Geoff
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