The bicyclist who rolls through a stop sign does so mostly at his or her own risk. Motorists who talk on a cell phone while driving, or exceed the speed limit, even by as little as 5 mph, are also breaking the law, but more importantly, they represent a vastly greater risk to other users of the road.
So maybe the police should have zero tolerance for either bicyclists or motorists who break the law. The reality is though that police resources are limited, and they can't catch all law breakers.
In this environment it's unfair and inappropriate to single out bicyclists for ticketing. The police should make safety their top priority and go after motorists who speed and use their cell phones. When they've got those problems under control they should begin to worry about what cyclists are doing.
John Higgins, Marmona Drive, Menlo Park