Travellers heading towards France could face traffic delays for several weeks, police have warned, as UK officials assist French border staff to help ease congestion.
The combination of new security checks and a holiday exodus caused "extraordinary" tailbacks this weekend amid soaring temperatures.
A police helicopter has been sent out to help provide water to motorists stuck in the delays at Dover, as security was stepped up in the wake of the Nice attacks.
Highways England has warned drivers that they may face delays of up to 10 hours, and advised them to use a different route.
In a statement they said: "All traffic is being advised to use the M20/A20 as the A2 is at a standstill into the Port of Dover."
New security checks for travellers heading to France cause tailbacks of up to 20 hours for some.
As police warn disruption at Dover is set to continue, volunteers who came to the aid of stranded motorists offer further assistance.
Holidaymakers heading to the continent face ten hour delays as France has stepped up its security checks in the wake of the terror threat.