Operators at the English Channel port of Dover on Friday accused French border officials of "ruining the start to the summer getaway", blaming understaffing for hours-long queues.
Bosses at Dover port -- a key gateway to mainland Europe -- declared a "critical incident" and urged travellers to reconsider their holiday plans as ferry companies warned of delays of at least six hours.
"Woefully inadequate French border resource ruins start to the summer getaway," the port said in a statement.
"Despite the Port of Dover ... preparing over several months for the busy summer period, we are deeply frustrated that the resources at the French border overnight and early this morning has been woefully inadequate."
Passengers need to go through border checks carried out by French officials in Dover before they can board a ferry to cross to northern France.
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But the port said French staffing "has fallen far short of what is required to ensure a smooth first weekend of the peak summer getaway period".
French authorities said the increased holiday traffic had been anticipated and plans were in place for maximum staff levels on Friday morning.
However, they blamed an "unexpected technical incident" in the Channel Tunnel for delaying French personnel's arrival by more than an hour.
Most English schools start the summer holiday this week, making it one of the busiest periods for cross-Channel trips.
Motoring organisation the RAC said this weekend was expected to be the busiest summer getaway since it began tracking numbers in 2014, with an estimated 18.8 million leisure trips expected between Friday and Monday.
Port of Dover chief executive Doug Bannister told BBC radio: "We've got a critical incident under way. I would consider holding off heading for the port at this point in time until more is known."
He later said the situation had "improved since the early hours and the traffic is beginning to move through".
But he admitted he did not know how long it would take to clear the backlog.
Heavy traffic
Aerial footage of the port showed around eight lanes of slow-moving traffic backed up for about 300 metres, while other images posted online showed cars queued back into the town of Dover and long lines of lorries on a nearby motorway.
"Please be aware that there is heavy traffic at border control in the port of Dover," P&O Ferries told passengers.
"If you are booked to travel today please allow at least six hours to clear all security checks."
Twitter users complained that there was total gridlock while waiting to board the ferries.
"I'm booked onto 8am ferry from Dover and it's total gridlock. Moved 50 metres per hour," wrote one.
"At this rate it'll be 34 hours before I get to the port!"
Dover and its surrounding roads have previously been a bottleneck for delays since Britain left the European Union, its single market and customs union.
The queues have been blamed on increased checks and additional paperwork for freight traffic.
Local MP Natalie Elphicke said there had been "weeks of preparation", much of it with French counterparts, for the beginning of the tourist season.
"Despite all this, French border officers didn't turn up for work at the passport controls as needed. This has caused massive delays," she said.
"More French officers are reported to be arriving."
(With AFP)
