Riding in a crosswalk is the worst of the bicycle offenses, because the rider has a false sense of security. A Bicycle is a Vehicle. It is allowed, in fact encouraged, for a person to dismount and walk the bike across the street. A person walking a bicycle is a pedestrian . Pedestrians usually have the right of way.
Bicycle riders have no greater right of way than the other vehicles on the road.
The most dangerous practice of bicycle riders involves the law most often ignored. Riding at night requires a white light on the front and a red warning light on the rear. This is when you will see most bicyclists taking to the sidewalks, thinking they are then pedestrians. Not only are they violating at least two laws, they are on very dangerous ground. They are even more vulnerable, because not only can drivers not see them, but pedestrians and animals cannot see them coming to avoid surprise contact.