Have heard this idea before, but interesting article nevertheless: http://www.wired.com/2015/01/edmonton-freezeway-ice-skating/

David Patman, P. Eng. Transit Planner Winnipeg Transit | Service Development Division 421 Osborne Street | Winnipeg, Manitoba R3L 2A2 P: 204-986-5737 | dpatman@winnipeg.camailto:dpatman@winnipeg.ca