Click for traffic bans in Europe.
There is The Corridor, the A16 from Belgium down to the ferry ports.
I no longer go anywhere near the area and haven’t for over 10 years, so I’m not sure how far South you can go on it now, cos I’ve forgotten.
The ban in France tomorrow starts at midnight tonight through till 10pm, according to traffic ban.
Todays ban finishes at 7pm. If you can, get up through France tonight, now.
Your transport manager should know all about this and given you the information much earlier.