Operation Brock Barrier Set to Hit M20 Tonight Amid Dover Ferry Delays
The moveable barrier system known as Operation Brock will be deployed on the M20 in Kent tonight (Monday 21 March). The Kent Resilience Forum confirmed the move as a precaution due to ongoing reduced ferry capacity at the Port of Dover.
Why Are They Activating Operation Brock?
Though there’s enough room to handle displaced P&O freight, the Kent Resilience Forum is pulling the trigger on Operation Brock to keep traffic flowing smoothly through Kent and minimise disruption.
Operation Brock is part of a wider plan to brace Kent for possible channel service disruptions. To set it up safely, the M20 between junctions 8 and 9 will close from 8pm tonight. Both carriageways should reopen by 6am Tuesday 22 March—with the contraflow system active.
How Will Operation Brock Affect Drivers?
- The contraflow will run on the London-bound carriageway between junctions 8 and 9, near Maidstone and Ashford.
- Lorries bound for mainland Europe will be directed onto the coastbound carriageway, where they may have to queue.
- All other traffic, including local freight, cars, and motorbikes, will use the contraflow on the London-bound side.
- Drivers must follow signs carefully—cars and motorbikes are required to enter the contraflow.
- A fully signed diversion will be in place during the overnight closure.
What is Operation Brock?
Operation Brock keeps the M20 open in both directions during channel disruptions by setting up a contraflow system and directing HGVs onto specific routes. It’s a legal requirement for heavy goods vehicles heading to Dover or Eurotunnel to follow the designated routes when Brock is active.
The barrier is deployed by specialist machines, moving over 14,000 tonnes of concrete blocks and 8,000 cones in just a few hours—a huge logistical feat.
For full info and updates, visit nationalhighways.co.uk/travel-updates/operation-brock/.
Official Comments
“Given the ongoing suspension of P&O services, KRF partners have agreed to implement the Brock contraflow,” said Simon Jones, KRF Strategic Planning Lead and Kent County Council Corporate Director for Growth, Environment and Transport.
“This is the best way to protect local communities, keep Kent moving, and help people reach their destinations quickly and safely. We will review the situation constantly and remove the barrier as soon as possible. Thanks to everyone for their patience.”
Nicola Bell, Highways England Regional Director, added: “Smooth traffic flow in Kent is a top priority. Operation Brock allows local communities and businesses to operate with minimal disruption.
“We’ve seen before how the moveable barrier keeps freight flowing steadily into Eurotunnel and the Port of Dover, while letting motorists travel with minimum fuss. Hauliers must stick to the official routes and follow signage on the M20.”
