There were long tailbacks on the A16 motorway leading to Calais as lorries queued for access to the blockaded port.
Thousands of vehicles were also stuck on the M20 to Dover in the UK.
Employees of MyFerryLink were to meet on Wednesday morning to decide whether to continue their strike in protest at Monday's court decision not to extend the deadline on a decision to rent the company's ferries to Danish operator DFDS.
DFDS says it will keep 202 of the 600 workers employed by the cooperative SeaFrance, which has been trying to keep the contract.
Another ferry, on which 120 people work, is to be taken over by Eurotunnel for freight transport.