Which way you heading?
Ferry company ex U.K. may well check your papers before handing over your ticket, as they could be liable for landing illegals. They have been checking freight drivers for customs and covid papers where necessary.
If you’re running main roads there have been spot checks on peage and roundabouts.
Same as here the rules keep changing.
Fair few French “tourists” on road today, and some UK cars on ferries but I don’t know their reasons for traveling.
Roads are very quiet after 19hr00. Long distance night travel is allowed but you will stick out. More relaxed during the day, and nowhere near summer crowded.