The ring road (périphérique) is not affected, as well as the boulevards des Maréchaux and some other roads (the avenues in the Bois de Boulogne and the Bois de Vincennes, the Champs-Elysées, the Avenue Foch, the Avenue de la Grande Armée, the Rue Royale, etc).

Details of exempted roads in the following links (in French):

– Official Paris website (At the bottom of the page “Les rues de Paris restant à 50km/h” / “Paris streets to remain at 50km/h”, you will find the detail of exempted streets per area (centre = 1st to 4th arrondissement), you just have to click on the arrondissement number.)

– Map and details of exempted roads here.