My issue with these motorized 'bikes' is that they are using the same bike paths and bike lanes that non-motorized bikes are using, but are travelling at a much higher speed. I was on a dedicated bike lane today on the homeward commute when a dude on one of these motorized bikes attempted to pass me on the right side. I was travelling maybe 35 km/h. He was probably going 5 km/h faster than I was, and he wasn't pedaling at all. Full throttle, or half throttle, I honestly don't know how fast these things are capable of going.