http://www.timesonline.co.uk/tol/driving/article5864847.ece

THE government is to cut the national speed limit from 60mph to 50mph on most of Britain’s roads, enforced by a new generation of average speed cameras.
The reduction, to be imposed as early as next year, will affect two thirds of the country’s road network. Drivers will still be able to reach 70mph on motorways and dual carriageways and 60mph on the safest A roads.
The new 50mph limit is intended to reduce the high death toll on rural roads, where, in 2007, 69% of car crash fatalities took place. It will apply to single carriage A, B and C roads. Local authorities will have the power to raise the limit to 60mph on the safest roads, but will have to justify it.
Ministers plan to use average speed cameras, which monitor speeds over distances of up to six miles, to help enforce the new limit. The cameras have already been installed at 43 locations. The Home Office is expected to approve their wider use later this year.

:x The main issue I have is that you do not get natural gaps in the flow of traffic as you do normally on a 60 mph road where lorries are limited to 55 mph. So you get people taking huge risks to pull out from side roads due to frustration in waiting for a gap 