Imagine any big city anywhere in the world without traffic just for a day. Now, if that city were Paris, imagine further the photographic possibilities, not to mention the visual, auditory and olfactory potential. Imagine no more because on September 27th, that’s just what Paris is going to do: “Une Journée Sans Voiture” – A Day Without Car, for the first time in the city’s history. City Hall calls it “a crazy gamble, but achievable.” No motorized vehicle, with a few exceptions like ambulances, will be allowed to drive the streets. As Mayor Anne Hidalgo announced in March : “Paris will be completely transformed for a day. This is an opportunity for Parisians and tourists to enjoy the city without noise, pollution and therefore without stress.” Other cities including Montreal, Bogota, Mexico City, Ho Chi Minh City and Brussels have instituted Day Without Car programs, some of them permanently and some partially, closing certain streets and encouraging bike ridi