There are long delays for those at the Port of Dover trying to get to the continent on their bank holiday breaks.
The port reported processing time of two hours at the French border controls at Dover at 09:00 BST.
It posted on social media that ferry operators would accommodate passengers on their next available sailings.
A spokesperson advised that for safety reasons travellers should stay in their vehicles and thanked passengers for their patience.
He said: We are experiencing extremely high levels of traffic this morning and are working with French border police. Kent Highways and Kent Police to clear the queues as quickly as possible.”
A spokesperson for ferry operator DFDS said: “We are expecting a busy weekend.
“We highly recommend all customers have a confirmed reservation
“Please allow 120 minutes to complete border and check-in controls on arrival.”
The A20 Roundhill Tunnel is closed eastbound between the M20 (J13/A259/A2034) and the A260 near Folkestone, according to National Highways.
This closure is in place to prevent traffic queueing inside the tunnel following the delays at Dover.
A traffic-holding system for lorries queueing to cross the English Channel is in force for the holiday weekend.
Operation Brock sees lorries heading to Dover queue on one side of the M20, with the other carriageway operating as a contraflow.
It covers a 13-mile (20.9km) section of the motorway between junctions eight (Maidstone) and nine (Ashford).