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By holding motorists down to lower top speeds at peak times, the DfT believes that this stop-start effect can be prevented and the traffic kept moving, so yielding better journey times for all - and obviating the need to build more road.
So it's yet another attempt to save money by putting off building roads (thus increasing the problem for the future) and a quick snatch attempt to actually make MORE money off road users trying to get home from work - targetting those who are the backbone of the economy!