http://www.slate.com/articles/business/metropolis/2015/10/philly_went_car_free_for_the_pope_every_city_should_try_it.html

It was wonderfully, serenely, even disarmingly quiet in downtown Philadelphia this past weekend. At the order of the U.S. Secret Service, 4.7 square miles were cleared of automobiles for two days as Pope Francis, his entourage, and his devotees descended upon the city. While the expected massive crowds never quite materialized, the streets filled with local children playing, cyclists lazily pedaling about, and clusters of pilgrims wandering between events—all without a car in sight.