I just read the whole of this tread and i have to make one comment
' A responsible and courteous lorry driver would realise that he can only do a certain speed and after building up a sufficient tail back would pull into a layby for a minute or so to allow the traffic to pass and then move off again. Would cost the lorry driver a couple of minutes but think of the time it would save the other 30-40 drivers behind him collectively.
Where a) safe, b) possible (ie: there is actually a lay-by, or place to stop) and c) time permits.
Well obviously for the first two but 'c) time permits' no thats not a case really as tesco obviousy dont care about how long the journey takes as they have started reducing the maximum speeds on all their lorries. If they wanted there deliverys doing to a time scale then surly this was the wrong way to go about it.
Cant have your cake and eat it tesco