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.
Police have warned disruption on the roads to Dover could last until Monday causing further misery for holidaymakers.
Many travellers have been stuck in lengthy queues for hours, as they attempt to make their way towards the Channel at the beginning of the great summer getaway.
Kent Police, who alongside the coastguard are delivering more than 11,000 bottles of water to travellers, said the disruption is down to a "vast volume of holiday traffic" coupled with delays caused by heightened security at the border.
Shadow Home Secretary Andy Burnham said the Home Office and the Department of Transport had been "caught ill-prepared".
A Government spokesman said: "People's safety is paramount. We are acutely aware of the effect the disruption is having in the Dover area and we continue to co-operate with the French authorities about a range of operational matters."
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.