So, somehow Waterloo found a way to have marked crossings and pedestrian yield signs. They aren't always as effective as you'd hope they'd be, although it got better over time. I think everyone who lives near a roundabout has stories of drivers not yielding. But the marked crossings are there and the signs are there, and the news story in London made it sound like that was something that couldn't be done.
UPDATE: Waterloo created its own rules for yielding to pedestrians at roundabouts. According to the Record, the Ontario Traffic Manual states: “In Ontario, there is no formal pedestrian right-of-way at roundabouts unless accompanied by a traffic control device.”