I third the HGV notion.
Have to agree with the HGV comments, they are probably the main cause of accidents and tailbacks on the M1/M6 and every other major motorway in England, i can not understand for the life of me how they have not figured this out already. As soon as one dumb ass lorry driver decides to over take another at less than 60 MPH, its one lane for everyone and it just doesn't work.
Impose a restriction on Lorry drivers so they are not allowed by law to over take, BAN them to the outside lane, You will soon be reaping the rewards of a lot less accidents and reducing travel times / congestion during peak travel.