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Operation Stack information

What is Operation Stack?

Operation Stack is the name given to the traffic management plan used by Kent Police when, as a result of restrictions at the Port of Dover, it is necessary to transform sections of the M20 motorway into a lorry park.

When Operation Stack is running, Kent Police park lorries in three rows on parts of the carriageway on the M20 until they can direct them to either the Channel Tunnel or to ferries at Dover, as space becomes available. Other traffic is diverted from the motorway.

What junctions of the M20 are affected by Operation Stack?

Kent Police can implement three phases of Operation Stack:

Phase 1


Channel-bound lorries are parked on the M20 coast bound carriageway between Junctions 11 (Hythe) and 12 (Cheriton) while other traffic is diverted along the A20 via Junction 11.

Phase 2


When the M20 between junctions 11 and 12 becomes full, the coast bound carriageway between Junctions 8 (Maidstone) and 9 (Ashford) is also closed for lorry parking. This helps to reduce road congestion in and around Dover and at the Channel crossing terminals.

Phase 3


This involves closing the M20 London bound between junctions 9 and 8 (Ashford to Maidstone).

When is Operation Stack used?

Operation Stack is used when there are restrictions at the Port of Dover. Restrictions may be caused for such reasons as bad weather affecting channel crossings, or strike action.

Operation Stack remains an emergency provision for Kent Police and is only implemented following a thorough assessment of issues, including safety concerns and disruption on the road network.

Who manages Operation Stack?

Kent Police works with the Highways Agency, Kent County Council and other partner agencies to manage Operation Stack.
Once the decision has been made to use Operation Stack, Kent Police use their own emergency powers to close sections of the M20.

As the network operator for strategic roads, the Highways Agency is responsible for the M20 and for the A20 and provides traffic management in support of the police to enable them to implement Operation Stack.

The Highways Agency, Kent Police and Kent County Council review the extent to which Operation Stack has been implemented and are considering what improvements might be possible, both in the short and longer term - to reduce the delay for cross-Channel and local travellers.

Can I use the M20 when Operation Stack is in place?

During Operation Stack cars are diverted off of the M20 where junctions have been closed.
When Operation Stack is running, motorists are advised to avoid the area unless their journey is absolutely necessary.

Where can I find out if Operation Stack is in place?

The latest information about Operation Stack is available on the Kent Police website (link opens in a new window).

What do lorry drivers need to do during Operation Stack (ticket system)?

A ticket system for lorries is used during Operation Stack.
Drivers are given paperwork when at the front of the queue that they must present on arrival at the Port of Dover. If drivers arrive without this paperwork they will be turned away and directed back up the A2/M2/A249 to join the rear of the Stack queue.

What is the proposed solution to Operation Stack?

Read more about the proposed Operation Stack lorry park.

Copyright Kent County Council 2008