Anyone driving in France from the 1st July 2008 is now required to wear a reflective jacket (e.g. yellow hi-viz jacket or vest) when leaving the vehicle in the event of an emergency.
The new law applies at any time of the day or night and affects drivers of all types of vehicle. The safety jacket must be accessible from within the vehicle and should be put on before exiting the vehicle.
Failure to obey this new rule could result in a fine.