Temporarily holding back some of the slip-road traffic, for instance, seems to make the journey quicker for everyone in the end.

ECONOMIST: Traffic management

That means looking for the best way to avoid the fatal blips in the slip-road traffic flow, and also finding out how to correct the consequences quickly if a blip does nevertheless slip through.

ECONOMIST: Traffic management: Desynchronised | The

Each car starts with a certain position and speed, and the road thus has a particular density of cars that changes as they move along, and as new cars are injected from a junction slip-road.

ECONOMIST: Traffic management: Desynchronised | The

John Philpotts, prosecuting, said Bather then drove through a no-entry area along a slip road and went down the wrong side of a dual carriageway.

BBC: Connor Carl Bather sentenced for driving 'like a maniac'

The A11 southbound exit slip road to the A14 has also re-opened.

BBC: A14 crash: One dead and five injured at Cambridge

Hamilton saw the title slip through his fingers at Interlagos last season when he ran off the road trying to pass his then McLaren team-mate Fernando Alonso on the first lap.

BBC: Relaxed Hamilton ignores pressure