It seems exercise timed laps might be part of the problem in Toronto's High Park. From the attached Toronto Star article:
He blames the increase in speeding cyclists in High Park on an app where users can post exercise times for fitness activities and share them with followers. High Park’s main loop is a common route for users and some have posted speeds of 49 km/h, well above the speed limit.
“You can see bicycles racing, doing timed laps on these segments, hoping to get their personal best,” Mahoney said. “A bicycle is not a motor vehicle. However, it does need to obey all of the traffic laws.”