Traffic
Operation Brock — what it means for Dover and M20 traffic
Updated 2026-06-13 · 5 min read
How Operation Brock affects journeys to Dover port, ferries and the cruise terminal — contraflow, HGV queues and driver advice.
Operation Brock is the UK's standby scheme for queuing freight traffic when cross-Channel disruption is severe. When active, lorries may be held on the M20 contraflow while cars follow signed routes — adding time for anyone heading to Dover ferries, cruise terminal or Eurotunnel.
How to know if Brock is active
Kent Travel Hub shows Operation Brock status on the homepage live bar.
Overhead signs on the M20 are authoritative — follow them rather than sat-nav shortcuts through villages.
National Highways and Kent Police publish updates during major activations.
What drivers should do
Build 45–90 minutes extra into ferry and cruise connections when Brock is active.
Keep fuel, water and phone chargers in the car — queues can be slow-moving.
Pre-booked taxis can monitor conditions but cannot bypass official road closures.
Quick tips
- Check Brock status before leaving London or the M25.
- Do not use village rat-runs — enforcement is common.
- Operator apps still show sailing times — roads are the variable.
Frequently asked questions
What is Operation Brock?
A traffic management plan that parks HGVs on the M20 contraflow during severe Channel disruption, which can also slow car journeys to Dover.
Is Operation Brock active today?
Check the live status bar on Kent Travel Hub — Brock is only activated during significant cross-Channel disruption.
Planning travel through Dover?
Return to the live travel hub for port traffic, cruise arrivals and ferry updates — or pre-book a transfer with our transport partner RideConnect UK.