Cars wait to get gas at a petrol station at a supermarket in Saint-Sebastien-sur-Loire near Nantes, France, May 21, 2016 as Total has halted output at some units of three of its refineries in France due to protests over proposed labour law reform that have prompted a blockade of oil depots and petrol stations. REUTERS/Stephane Mahe ATTENTION EDITORS FRENCH LAW REQUIRES THAT VEHICLE REGISTRATION PLATES ARE MASKED IN PUBLICATIONS WITHIN FRANCE