People hoping to cross the Channel to France this weekend are being warned it will be very busy again, after three days of queues and delays.
And that pattern could continue with drivers warned by the AA they could face a summer of repeat delays.
Vehicles are flowing freely on Monday after a weekend that saw miles of tailbacks build up in Kent.
Kent Resilience Forum’s Toby Howe said it was a “very vulnerable situation” and took little to cause congestion.
Queues of lorries have begun to build at Dover, although the port said traffic was flowing normally.
Despite the improved traffic flow a critical incident declared over the weekend has remained in force.
Ferry operator DFDS told passengers there were “queues of around an hour” for French border checks, while P&O Ferries said queues had picked up.
Over the weekend traffic built up on the roads leading to the Eurotunnel terminal in Folkestone and Port of Dover after the M20 motorway through Kent to the south coast was closed to cars from Maidstone to Folkestone because of Operation Brock, which sees lorries diverted to park on the motorway.
With the motorway shut, car drivers were diverted to smaller roads which then got jammed with miles of tailbacks.
Some people reported sleeping overnight in their cars, while one tired family said the last three miles of their journey took 21 hours.
He said on Friday the Port of Dover had issues with a lack of resources, which was compounded by a crash on the motorway.
“You only need another crash on the road or maybe a train breakdown or a power failure somewhere for it to then become a big problem.“
Mr Howe said there needed to be more infrastructure in place to take traffic off the roads, such as lorry parks.
“We shouldn’t really have to have queues of traffic due to all of this, so we need more infrastructure in place,” he said.
The AA’s head of roads policy Jack Cousens said it had been an “incredible weekend of traffic jams” but warned the group was concerned “we could be in for a repeat of this congestion across the summer”.
John Keefe, director of public affairs for Getlink – which operates the Eurotunnel between Folkestone and Calais, said the issue over the weekend had been caused by the expected “very heavy traffic of passengers” getting away on holidays alongside an unexpected amount of truck traffic, which would normally have crossed to France earlier but had been delayed by an accident on the motorway.
He said there were several factors that could help ease the situation, including bringing in digital technology to speed up border checks, increasing the resilience of the road network – with two of the UK’s biggest ports served by the same motorway – and improving the Channel tunnel railway network.
Mr Keefe added: “There are definitely solutions. These solutions are not new. They’ve been on the table for many, many years.