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
Status of Operation Brock
M20 – Open with Brock contraflow in operation
EU freight traffic - use M20, A20 for Eurotunnel and Port of Dover
Contraflow open in both directions for non-port traffic.
Alerts
We'll use these alerts at the top of this page to tell you the status of Operation Brock:
M20 is open
M20 closed for Brock contraflow installation or removal
Between:
- junctions 8 – 9 westbound
- junctions 7 – 9 eastbound
Please follow diversion routes.
M20 – Open with Brock contraflow in operation
EU freight traffic - use M20, A20 for Eurotunnel and Port of Dover
Contraflow open in both directions for non-port traffic.
M20 – Brock contraflow closed junction 8 to 9
EU freight traffic - use M20 and join Brock
All eastbound non-port traffic - use diversion routes.
Contraflow remains open for westbound and London bound traffic.
M20 – Brock contraflow closed junctions 9 to 11 eastbound
EU freight traffic - use M20 and join Brock.
All eastbound non-port traffic - use diversion routes.
Contraflow remains open for westbound and London bound traffic.
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.
Maintenance
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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