Cross-channel travel disruption is set to continue into the weekend due to the ongoing problems at Calais terminals and the impact of Operation Stack.
Kent Police says Operation Stack is in place on the M20 coastbound (eastbound) between junction eight and junction eleven. It is expected to remain in place into the weekend.
Freight lorries queuing for Dover and Eurotunnel are facing delays of up to several hours.
EU rules have temporarily been relaxed to allow lorry drivers to drive for longer stretches of time with a shorter break, to contend with the delays.
The M20 and A20 routes are scheduled by the Highways Agency to re-open at 3pm on Sunday.
Kent Highways is providing regular updates from its Twitter account.
All travellers are urged to contact their operator before setting off on their journeys.
Access to the Eurotunnel's Folkestone terminal from the A20 is also closed until August 15 due to ongoing improvement works. Drivers are instead asked to continue along the A20 and join the M20 southbound at junction 11, then access the terminal via M20 junction 11a.
Eurostar is not currently forecasting disruption over the weekend.
P&O Ferries says all services are running but warned on Friday morning that roads in and around Dover are heavily congested, advising people to leave extra time for their journeys.
The NHS has issued the following advice for holidaymakers, especially those travelling with children or older people:
As well as leaving extra time for their journey, holidaymakers are advised to take food and drink with them so they are well prepared for any delays.
Anyone taking regular medication should make sure they have enough of this with them to cover the time while they are on holiday, as well as sufficient to cover any extra time due to travel delays. If you are travelling with young children, the elderly or someone with specific health needs please make sure you consider anything additional you may need to take with you for them.
If you or one of your party does become ill during your journey, the NHS would urge people to consider which is the most appropriate place to go to get help for their health needs.
People should call NHS 111 if they need medical help, but it’s not a life-threatening emergency. For less urgent health needs, they should contact their GP or local pharmacist in the usual way. For immediate, life-threatening emergencies they should always call 999. To find the nearest health service and to check your symptoms visit the NHS Choices website.