Those letters you carry are a bit nonsensical though, aren't they - you just fill them out for yourself as/when needed. Not ideal for anyone who doesnt have a printer or ink though.
I live in France. They aren't nonsensical. They clearly state the reason you have left the house, your address and the time you went out. Makes it quite easy to see if people have been out too long or are too far away from home. You also need to carry ID.
There are different boxes to tick. No options to add your own reasons. You must do this before you leave the house - no filling it in once you see a Gendarme.
If you don't have a printer you can write them out. Electronic versions are not acceptable.
You are expected to use the nearest supermarket.
Exercise is now restricted to within 1km of your home address for one hour a day - and you must be alone
Cycling for leisure is not allowed.
No "just going out for a drive".
No "dropping off cakes to a mate".
If you repeatedly break the rules you can be sentenced to 6 months prison.
It was a lot less restrictive at the beginning, but people took the piss.
The UK are headed for some version of this.