Also note that Radar detectors are forbidden in Europe. Satnav and GPS systems which show where speed cameras are located may also be illegal in some countries - esp France. So make sure this function is disabled or removed completely from your device.
In France, everybody standing on the hard shoulder has to have a Hi-viz vest. Since the recommendation is to get out of the car in case of motorway breakdown, you will need a vest for every person in the car. The driver's vest must be easily accessible. ie, inside the car (not the boot); the passenger's vests may be kept in the boot but must be worn before getting out of the car.