We're closing our live page for today.
We'll bring you regular updates on this story as we get them.
This is Piers Hopkirk's report from our 18:30 BST programme.
BBC South East Today reporter
The boss of the Port of Calais says he's urging the French Government to increase their staffing levels in Dover after heightened security checks caused misery for motorists and delays of 15 hours over the weekend.
A statement from the Port of Dover this afternoon says it raised concerns several days before the delays began.
It says: "We raised concerns over French manning levels with the UK Government days before the situation developed, and the Government, in turn, raised the issue with its French counterparts.
"We are determined to continue working with the UK authorities to find a way of ensuring that French border control posts are suitably staffed in future.
"Ultimately, international border policy can only be resolved by governments, but we will do all we can alongside Government, partner organisations and ferry operators to develop a long term solution that will ensure trade and tourist traffic remains fluid through this crucial European gateway.
"The Port of Dover would like to thank all those organisations which, alongside Port staff, worked round the clock to tackle the weekend’s queues and ensure public welfare."
We'll have more interviews, reaction and analysis on BBC South East Today at 18:30 BST on BBC One.
BBC South East Today
I've been speaking to businesses in Dover this afternoon.
The congestion has barely ended, but the Freight Transport Association (FTA) is already calling for measures to prevent it from happening again.
The FTA says it's "unforgiveable" that the French border force was under-resourced, and also wants Highways England to consider whether the proposed lorry park in Stanford could also be used for cars if a similar situation occurs in the future.
Natalie Chapman, FTA Head of Policy for the South East, said: "Dover is vital to the UK economy with up to £120 billion worth of trade going through the Port every year.
"There must be better processes put in place at the Port with extra personnel drafted in at peak times - otherwise there is a risk that Operation Stack may be introduced and we cannot have a repeat performance of last year."
The problems at Dover were the main topic on Julia George's mid-morning phone-in on BBC Radio Kent.
Dover MP Charlie Elphicke has warned there may be a summer of traffic chaos in East Kent if action is not taken.
A family was stuck in the car at the border for so long that they had to cook food in the back seat.
Amy Capron spoke to the BBC about the hours she was spent trapped in the car.
There were long delays for motorists in East Kent trying to cross the Channel. Sound familiar? That was the top story exactly one year ago...due to Operation Stack. Here's our #onthisday in Kent.
Transport analyst Chris Tarry says lessons need to be learned after the chaos at Dover over the weekend.
Prior to the problems at Dover over the weekend, the BBC discovered border force staff have been pulled off duty from the port to help reduce the passport queues at Heathrow.
Targets for dealing with non-EU arrivals at the airport have been routinely missed since May.
This Border Force official, says the whole system's not working. His words are spoken by a BBC staff member.
Helen Deeble, chief executive of P&O Ferries, has apologised to customers but insisted the lack of border control staff was the "primary cause" of the congestion.
She said: "The scenes which we saw at the weekend at the Port of Dover, with holidaymakers delayed for completely unacceptable lengths of time, must never be allowed to happen again.
"Increased security checks at the border are completely understandable but the French authorities must provide adequate numbers of staff to ensure that these checks can be processed quickly and efficiently.
"The failure to do so at the weekend was the primary cause of the delays."
BBC cameraman Tony Dolce has tweeted these pics:
And you're not impressed with what you've been hearing today.
The Calais local government said "maximum numbers of border police" had been deployed.
Given the European context and the prolonged state of emergency in France, border controls have been intensified. Maximum numbers of border police have been deployed to do these checks."
The chief executive of the Port of Calais has described the 15-hour wait of some motorists heading to the port of Dover at the weekend as "unacceptable".
Dover MP Charlie Elphicke has expressed his concerns about how the number of illegal immigrants trying to get into the UK could increase if the chaos at Dover continues.
P&O Ferries said its midday crossing is expected to depart on time.
BBC South East Today
Here's my latest report on how the roads running into the Port of Dover are looking.
BBC Radio 4
The chief executive of the Port of Calais, Jean-Marc Puissesseau, has described as "unacceptable" the 15-hour delays faced by some motorists heading to the Port of Dover at the weekend.
Mr Puissesseau told Radio 4's Today programme that he'd be contacting the French Home Office in Paris to urge them to increase staffing levels.
Simon Jones from Highways England said the agency had been "working hard" to alleviate the problems.
P&O Ferries are reporting the roads are running smoothly into the Port of Dover.
BBC South East Today
I'm at Dover keeping an eye on how things are progressing. Here's my latest report.
The Dover and Deal MP has spoken strongly of the government's need to "take control" of the situation at Dover.
Welcome to another working week.
We'll be here till 17:00 BST keeping a close eye on the delays at Dover, while still bringing you news, travel and weather from around Kent.
Michelle McLemon sent us this picture of her twins on Sandown Beach in Deal - it's our #photooftheday.