Earlier today I had the misfortune of having to make a necessary journey that was partly round the circular car park that the M25 has become, even on a Saturday morning. Came to the conclusion that if the signs show 60 mph, you will be in stop-start traffic averaging about 20 mph, if they show 50 you will be crawling along at 5 mph, and 40 means you will be stationary most of the time. Also when you came to the first sign warning of 'Congestion ahead', you were already sitting in a traffic jam! Probably not really that 'Smart'! 
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