French riot police stand next to an overturned car as striking French taxi drivers demonstrate at the Porte Maillot to block the traffic on the Paris ring road during a national protest against car-sharing service Uber, in Paris, France, June 25, 2015. French taxi drivers stepped up protests against U.S. online cab service UberPOP on Thursday, blocking road access to airports and train stations in Paris and other cities. REUTERS/Charles Platiau