Have travelled regularly in France in a car with no problem. Did it in the motorhome this year and got caught by a camera. A 40 euro fine arrived on the mat a week or so after return, with about 60 days to pay before it went up a bit. I set the satnav to KPH and kept to that apart from the one time I went a bit over. Same as this country really, keep within the limit and you wont get nicked. Dont let the wonderful scenery distract you