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

Current 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.

‘Brock’ is a contraflow that 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.

Freight drivers - be sure to use the correct lane

Use an M20 contraflow lane if you’re delivering to a location in Kent or returning to base in Kent.

Use the correct coastbound Brock lane if you’re travelling to Europe including via services or the Inland Border Facility.


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


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.


Sign up for updates

Keep updated on Operation Brock. Receive email bulletins when we update this page.

Subscribe to this page