Allow traffic to flow freely on all lanes of the moterway, overtaking should be allowed on any lane, this works perfectly well in the US. Allowing all lanes to be fully used would increase space and stop the frustration caused by slow vehicles in the middle and outside lanes.
Why does this idea matter?
Control the entry of traffic from slip roads onto moterways. A lot of the congestion on moterways is caused at junctions by vehicles in slip roads forceing their way into traffic, this not only causes delays but is dangerous as vehicles try to force their way to the outside lane.
The entry of vehicles from slip roads should be controlled so that the moterways move freely, this is done in the US on busy roads by traffic lights on slip roads that control the flow of traffic.