Traffic on the roads surrounding the Port of Dover is "slow moving", the port is warning in a new update.
"The surrounding roads are slow moving", it says. "In the tourist check-in plaza and approach lanes, there are queues for all ferry operators."
This follows an update a short while ago, in which the port warned that "the surrounding roads are still very congested, and traffic exiting the port is being directed onto the A2 only".
The port adds that the "processing time for tourist traffic in the Buffer Zone" has now reduced to 45 minutes, when earlier it was 90 minutes.
The Port of Dover describes the Buffer Zone as an area "at the front of the port", where "traffic may be held in multiple lanes" while waiting to pass through French border and security checks.
New Entry/Exit Systems (EES) - in which British passengers have their photo and fingerprints taken to be allowed enter France - have been suspended, the port says - the statement in full
The port says the rest of the day is likely to prove challenging, writes the BBC's Simon Jones
Passengers who miss their ferry crossing due to wait times will be able to travel on the next available crossing, the port says
Doug Bannister, the CEO of the Port of Dover, says they "always knew" this would be a busy period - noting there are more than 8,000 cars booked today.
"Despite having assurances from authorities from our government and the French around how this would work, it really was slow processing this morning," he tells the BBC.
Bannister says that, ahead of the changes, the Port of Dover had invested £40m and built a new facility to "handle these peak volumes efficiently and safely" but the technology to open it "has not been activated".
"We're all quite frustrated," he says, explaining that the port has invested "millions of pounds in working towards what would be the best border experience within the new EES system and we're prevented from operating that way".
He also gave detail about the "Article 9 clause" which the port earlier said had been invoked by French authorities, explaining that this allows "some bits of the process to be suspended for a short period of time" when there is congestion.
A new EU digital border system was introduced in October last year, changing the requirements for British citizens travelling to the Schengen area.
The system - known as Entry/Exit System or EES - replaces passport stamping with digitally recorded entries. Those travelling on a UK passport may be required to register biometric details like fingerprints and a photo, the UK Foreign Office explains.
The Port of Dover has said previously it is "working closely" with French border agency partners to "ensure a smooth introduction" for tourist passengers.
But after long delays heading into the bank holiday weekend - seen as a major test of the new system - French authorities suspended the extra checks today after the port escalated the "challenging situation".
As we reported earlier, French authorities had not yet switched on the fingerprint and photo machines, but still had to create profiles for travellers linked to the new system, contributing to delays.