I disagree with you, PaulRivers. It's safer to cycle on the sidewalks for whom? For cyclists, right? What about pedestrians? Are moms with strollers and seniors supposed to scoot out of the way? I don't think so. When I'm crossing the street, I look for cars and bikes. When I'm walking on a sidewalk, I shouldn't have to worry about getting run over.
I see people ride on the sidewalks, I almost got my arm taken out by some jerk riding at full speed. If we, as cyclists insist to be treated as vehicles and get respect from motorists, we need to behave like vehicles. And sidewalk is no place for vehicles.
In Toronto only bikes with wheels smaller than 24" are allowed on sidewalks, this is geared towards the kids. It's a bylaw and can cost you $90 if caught.