on the road and obeying the laws. 15+ mph on a sidewalk is asking for flat tires, messed up wheels, and a really good chance at going over the handlebars. While riding on sidewalks you are a danger to pedestrians, plus drivers are less likely to notice cyclists on sidewalks which makes intersections and driveways extremely dangerous.
There are some streets in this town that are 'ride at your own risk' deadly, so I'll take the sidewalk for them. It has the added bonus that only about 50 people walk anywhere here, and 5 of them live with ME.