Getting lorries off the roads and back onto the railways and canals would help out no end. Fine on motorways, but when they start using B roads it just causes chaos for everybody.
Wide open roads with no houses where you can see for miles should all be 70mph, and only employ speed cameras in genuine accident blackspots with plenty of visible warnings about the exact nature of the hazard present. That way, people would be more likely to respect them and any necessarily enforced lower speed limit.
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