Published: 19:57, 28 March 2019
| Updated: 19:59, 28 March 2019
Bosses at Eurotunnel have spent more than £12 million getting ready for Brexit.
The company says they've spent millions preparing for any scenario ahead of the UK leaving the EU - which was expected to be tomorrow.
While most passengers won't notice any difference, lorry drivers now need to fill out customs documents which have to be scanned and processed.
Kristina Curtis went to France to find out more
John Keefe, spokesman for Eurotunnel said: "We're ready. We set March 29 as our deadline and we're ready."
The company's readiness is what caused the early implementation of Operation Brock.
The contraflow was introduced on Monday on the M20 between Maidstone and Ashford and is being reviewed on a weekly basis.