Philly Free Streets, the city event in which a number of streets are shut down for people to run, bike, or walk, is returning for its third year on Saturday — this time on North Broad Street, which will be closed to vehicles for four miles between City Hall and Erie Avenue (streets will be closed to cars starting at 6 a.m. on Saturday). Inspired by Pope Francis' visit in 2015, the event was created in 2016 to highlight Philly's walkability and encourage everyone to exercise.