bel:
I think this is also common in England. I spent a month or so on a bike in England in '77, and I seem to remember that I was told to avoid a certain area because they were all going to go on holiday and the roads would be jammed with caravans.
On inquiry, I learned that different parts of England tended to have holday at different times of the summer. Of course in almost a quarter of a century that may have changed a bit, but knowing England and the English I suspect not much.
And doesn't Paris close down for August?