
Compact centers & corridors
Desert metropolis sustainability push
The voter-ratified general plan for Phoenix, Arizona, adopted in 2015 under the banner PlanPHX. It reoriented one of America's archetypal low-density desert metropolises towards a structure of compact centres and corridors, building on the Valley Metro light rail spine, and emphasised walkable cores, infill, heat mitigation and water-conscious development in place of continued fringe expansion.
The plan signals the mainstreaming of sustainability and transit-oriented thinking in Sunbelt cities long defined by automobile-led sprawl. Its significance lies in the tension it embodies between corridor intensification rhetoric and the continuing pull of peripheral growth, making Phoenix a recurring case in debates on retrofitting suburbia and planning for extreme heat in arid metropolises.