Since the idea of a motorway box inside the city was abandoned because of local opposition in the 1960s, nobody has put forward a better idea for what to do.

ECONOMIST: Road pricing

The pair got the idea from the American illusionist David Blaine who recently spent 44 days without any food inside a plastic box suspended by a crane near the River Thames in London.

BBC: Andrew Coke and Steve Roberts spent 30 hours in the cage