Ferry services to and from Calais are suspended today because of a national strike in France.
P&O Ferries says it had produced an “optimised” sailing schedule, but has warned a “lack of details” means it cannot anticipate how much disruption there will be.
“If your journey is not essential, we do advise that you rearrange your travel to an alternative date,” the company added.
The Port of Dover said it “is still open with services to Dunkirk running as normal” – but travellers should expect its facilities and local roads to be busier than usual.
Sailings to Calais are expected to resume from 2pm.
Eurostar said its services would also be affected by the general strike in France, and it would be running a “revised timetable” today and tomorrow.
Passengers have been told to check if their train has been cancelled.