The blockade by French fishermen at the port of Calais is also causing motorway disruption in Kent as vehicles queue to travel on the Channel Tunnel.
Fishing fleets have been stopping ships entering or leaving Calais, Boulogne and Dunkirk since Tuesday, in a dispute over fishing quotas.
Ferry operator P&O has cancelled all Dover to Calais crossings and has said the protest was costing them £1m a day.
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