As Toronto continues to make progress on the Gardiner Expressway’s rehabilitation, there is a groundswell of support for retrofitting the under-highway as well—including spaces like the Bentway that transform overlooked infrastructure into vital public space. While transformation of the Gardiner’s understory is a long-term ambition, it’s important to reflect on the concept itself, and where that concept has already found success. Miami’s The Underline is somewhat of a “sister proj...