You'll be able to provide a link to where they say that will you?
Here - Brexit Preparedness Report-March 2019 - page 39
www.kent.gov.uk/about-the-council/britain-leaving-the-european-union/our-preparation-for-brexit
"fine" was my choice of words - I wasn't quoting;
"These preparations should ensure that freight using the main corridor routes through Kent is kept moving."
^"This has been possible due to the joint learning across all partners
who dealt with the 2015 Operation Stack event, and weekend industrial action in 2016, and utilises the ‘Operational Fennel’ multi-agency group, consisting of Highways England, Kent Police, KCC Highways and many other key stakeholders, including the Port of Dover, Eurotunnel and Borough and District representatives"^ ...
4.4 On 7 January 2019, the DfT and KCC carried out a flow test of the Operation Brock Traffic Management system.
"The test went well" and all partners considered that the operation was sufficient to test the flow rate and A256 TAP sufficiency.89 vehicles took part in the test, at a batch of 25, at 6 vehicles a minute.The second batch of 83, were released at just over 6 in a minute.This simulated roughly 400 vehicles an hour, in excess of the 350 threshold.The test used both right and left-hand drive vehicles.
By way of comparison, in 2015 partners tested 20 vehicles.
4.5 Local permit arrangements are being explored so that local hauliers would not be required to join freight queues to exit the UK when moving around the county.