When a road is closed, why isn't the diversion route just the quickest way past the closure?
The one great attempt to make London’s streets logical - and how one retired chauffeur’s favourite routes changed the way you get around the capital.
Today two motorways cross the Severn near Chepstow. But as recently as 1965, the only crossing was a ferry that carried six cars at a time, from Aust to Beachley.
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