Are Things THAT Different Out West?

According to a report on the ABC7 News Web Site, the San Jose City Council will vote today on banning the riding of bicycles on downtown sidewalks? Is this really legal at the present time? Back East, even my quiet suburb of Phildelphia did not allow bicycle-riding on the sidewalks. I just took it for granted that the sidewalks were for pedestrians in any American city. Are bikes also allowed on the sidewalks of San Francisco? More to the point, if riding a bicycle on the sidewalk is, indeed, a moving violation, when and how will the police begin to enforce it?