This quote comes from an anecdote from the Bike Snob NYC. And it is a sentiment with which I am in whole hearted agreement. Sidewalks are for pedestrians, children, dog walkers, strollers, etc. Bikes belong in the street, following traffic laws. I get nervous in traffic. But, I still ride in the street. I follow the rules and behave predictably so that drivers will not be second guessing me and putting all of us in jeopardy. Good behavior on your bike makes you safer in the moment and helps motorists learn what to expect from cyclists, keeping all of us safer in the future.