A contraflow system is being deployed on a 13-mile section of the M20 between junctions 8 (for Maidstone) and 9 (at Ashford) ahead of the summer holidays, due to expected high passenger numbers.  
Operation Brock is part of a series of measures to improve Kent’s resilience and ensure the smooth flow of traffic through the region in the event of disruption to services across the English Channel. 

To safely deploy the contraflow, the M20 will be closed – London bound from junction 9 to 8 and coastbound junction 7 to 9 – overnight from 8pm on Wednesday 10 July to 6am on Thursday 11 July. 

Fully signed diversion routes will be in place while the M20 is closed overnight. These times have been chosen to minimise disruption to road users.  

When the M20 reopens on Thursday, 11 July, the Brock contraflow will be in place and all signs should be followed. Once the barrier is in place, all HGVs heading for the Port of Dover or Eurotunnel must follow the signs to join Operation Brock at M20 junction 8.

Any EU-bound HGVs not complying with signage and trying to use another route to Eurotunnel or the Port of Dover risk a fine of £300. They will also be sent to the back of the queue by Police or enforcement agents, wasting time, fuel, and money. This includes trying to bypass the M20 by using the M2/A2 at Brenley Corner. 

All other coast bound traffic – including local freight and car drivers heading for the continent – should follow the signs and cross over to enter the contraflow on the M20 London bound carriageway.