Change the law so that drivers are permitted to undertake drivers in the middle or outer lanes of motorways & dual carriageways while the inner lanes remain unused.
Why does this idea matter?
At present I often see almost every car on the motorway jammed into the outside lane, leaving most of the motorway unused.
If undertaking was permitted, subject to basic safety guidance, it would remove the temptation for drivers to hog the middle or outer lanes, and encourage everyone to use the inner lanes, and only move out when overtaking.
I understand this is the case in the US, where it appears to work.