Operation Brock

The Operation Brock contraflow system is designed to keep traffic on the M20 and other roads in Kent moving when there is disruption to travel across the English Channel

Operation Brock

Status of Operation Brock


We'll use these alerts at the top of this page to tell you the status of Operation Brock:

When there’s any sort of disruption in the channel, HGV traffic on the M20 heading for the Port of Dover or the Eurotunnel has nowhere to go.

That’s why there’s now a contraflow system in place, that we call ‘Brock’, which can be set up overnight. It separates traffic into different lanes across both carriageways and keeps the M20 and other local roads open and moving.

It means, once the contraflow is in, if you’re on the M20 but not going to the port or the Eurotunnel, you can continue your journey as normal. At the same time, it helps control how port-bound HGVs make their way to the Port of Dover or the Eurotunnel.


From time to time, we'll need to close the M20 to maintain the moveable concrete barrier.

You can find out more about routine closures on our Travel Alerts page or by following our regional Twitter feed.


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