The basic plan of the project features the aforementioned green covering over the expressway - punctured by openings for exhaust and views to the roadway below - that extends to embrace adjacent developments, and additional towers that help to define the corridor as an appealing frontage for future development. Johnson's towers are articulated to further the sustainable basis of the park, with raised gardens and facades fronting the park shaped to act as wind scoops to circulate and clean the air, along with the park, of the submerged expressway. Kennedy Expressway Green Corridor.Chicago, Illinois