The thing is the French don't view cyclists as a bloody nusiance, when you are overtaken they give you lot's of room, most sundays in villages and towns there is the club run, so motorists are used to cyclists being on the road, however the main differance to the UK is French roads are generally long and straight, but it is a better mindset from drivers, alot of whom probably ride as well, so they know what it is like to be on a bike so are more careful around cyclists.
Not in my experience over a number of years in France and specifically last week touring in Provence:
1. Up hill. Armco to my right. Secondary road position. Large HGV overtakes too close and gets closer to the point where I could have touched the Armco on my right and his wheel on my left. I have never has such a close pass in the UK - my wife was riding behind and was terrified for my safety and asked if I was ok and needed to stop when she caught up a few moments later.
2. Group of 13, split into two sub groups. with the length of a cricket wicket between. Large farm with large trailer attached, overtakes rear group, stays wide but passes second group very close and pulls in, the trailer forcing the riders almost into the verge.
3. Riding up the Gorges du Verdun. Rock wall to the left. Stone parapet and deep drop to the right. Winding bends. Car overtakes on bend and is met by car coming the other way. Pulls in hard at an angle part way along the group leaving zero space at the front. Both cars and cyclists forced to a standstill.
There were many other close passes less dramatic, but equally well short of the mythical 1.5m
And one not passing related:
I'm going down hill (on the route from Sault to Gorges de Nesque. Long. Straight. Steep. 20/25mph. Wide cycle lanes both sides. Car pulls out of side turning. Stops front wheels into the main carriageway, completely straddling the Cycle Lane. I'm forced into emergency braking to the point of locking up. Only escape is to swing very sharply behind him. How I managed to first avoid T-boning him and second to stay upright on the swing behind I still do not know. Garmin trace clearly show heart rate spike.
A typical cycling week for me is 150 miles in the Surrey Hills and the Thames Valley west from Kingston - in 10 years I can recall one event where I felt as directly in danger as those 4 events in a single week in Provence.