I’ve read conflicting things, mostly in the 3-5 second range. One time we were chatting with a man who said he’d been pulled over by police because he didn’t stop long enough at a sign. It’s typical of our marriage that I remember that he said it should have been 10 seconds and my husband remembers 3 seconds.
For years I’ve been telling my husband that U-turns are not allowed in France, as he makes another U-turn. Obviously my say-so isn’t enough to convince him. But if I were to tell him that Survive France is unanimous in saying we have to stop for x seconds at a sign, that might carry some weight.
I know that unanimity is unlikely unless you’ve all taken French driver training, but I’m willing to go by majority vote, as long as you all say it’s more than 3 seconds.