Signs like these have popped up in San Francisco, ever since some "fist-shaking" senior citizens started campaigning against bicyclists. Good for them.
While bicyclist behavior that annoys motorists doesn't bother me much, pedestrians are already marginalized and abused enough. I always discourage bicyclists from riding on sidewalks. As I say on my Bike Commuting Tips pages:
Many beginning cyclists think that riding on the sidewalk is safer than riding in the street. They couldn't be more wrong. Cycling on the sidewalk means you have to dodge pedestrians, pets, scaffolding, garbage cans, parking meters and signs, vehicles exiting driveways and garages, landscaping, trees and leafy debris, motorists turning off the street, pedestrians leaving buildings without expecting a high velocity traveler sharing their space, and police officers with a ticket quota to meet.Senior citizens and pedestrians are also oppressed by motorists. They should be allies of bicyclists, not enemies. When they see bicyclists organized as an effective political force against threatening traffic, they will join in our efforts against the automotive scourge.
In the meantime, stay off the sidewalks.
Image: Marianne Skoczek
Visit: Paul Dorn's Bike Commuting Tips