Be aware that French drivers tailgate.
Be extra vigilant exiting garages etc that you stay on the right, even regular visitors to mainland Europe slip up.
Not only are the speed cameras hard to detect, there are new ones in some areas fitted into the Armco barriers on autoroutes. They also ALL used to have warning signs before the camera, not so any longer, although there are still plenty that do.
If you are using a SatNav, it is illegal in France to have the audible warning of speed cameras and traps turned on.
Good luck and enjoy the experience.