Bicyclists on the sidewalk can be super annoying. And sometimes dangerous.
In an effort to keep my recent story on auto-bike collisions manageable and sort of concise, I focused primarily on streets. But sidewalk cycling also is a big deal; on sidewalks bicyclists can collide with pedestrians and in some places sidewalk riding is actually illegal.
A study from the New York Department of Transportation indicates that protected bike lanes offer one potential solution. The study looked at Columbus Avenue in New York City, where a protected bike lane was carved out of a formerly car-centric street.