The migrant crisis in Calais and intermittent strike action by French ferry workers means truckers are spending hours stuck in Kent and northern France.
Authorities at the Port of Dover are advising holidaymakers to use an alternative route on the M2 and A2 and allow plenty of time for their journey.
Further delays hit cross-Channel services when the body of a teenager, suspected to be a migrant who died in a desperate attempt to reach the UK,
was found on the roof of a Eurotunnel train in Folkestone yesterday.
LeShuttle operators warned of delays of up to an hour “due to migrant activity” this morning but said a full service was in operation.
Ferries operated by P&O were also delayed by between 50 minutes and an hour-and-a-half.
Travel to and from Calais has been affected by several crises this summer, including attempts by an estimated 5,000 migrants displaced from countries including Syria, Libya and Eritrea to cross to Britain.