Motorists on the M20 will find themselves at the centre of a trial of a new segregation system for Operation Stack from today.

The new "self-segregation" procedure is aimed at increasing the efficiency of the contra-flow system used when Kent police implement Stack.

The trial will start at around noon and continue for three hours. Cones will be placed just before junction 11 coastbound on the M20 (Stanford/Hythe) to channel cars less than 6ft 6in wide into the third lane.

They will then move into the contraflow system at junction 11 and onto the London-bound carriageway but going coastbound, where there will also be the quick moveable barrier to separate them from London-bound traffic.

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Other traffic travelling to Dover will use lanes one and two of the coastbound carriageway.

Only the live trial of the segregation procedure will take place, not Stack itself.