The Underline, which broke ground today, combines green public space with paths that connect to transit stations, fully separated from the adjacent street, where 100,000 cars drive by each day. (The plan was a finalist in the Fast Company 2017 World Changing Ideas Award.)

“Miami-Dade County is one of the most dangerous places to walk and bike in the country,” says Meg Daly, who started a nonprofit to champion the project after walking under the rail line–a dimly lit, dirty, unwelcoming area, surrounded by heavy traffic and hard-to-cross streets–and seeing its potential. “We’re not just moving in our cars because we’re car-centric, we’re in our cars because we feel safer.”

Check out this “3-minute read” here.