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.
An early triumph of the motorway programme, the M4 between Chiswick and Langley linked Central London to Heathrow - then still known as London Airport - and was the start of a new motorway west.
Buy me a coffee