2405.1f No person shall stop, stand, or park a motor vehicle or trailer in any of the following places, except when necessary to avoid conflict with other traffic, in compliance with law, or at the direction of a police officer or traffic control device: In any driveway, alley entrance, or other way when stopping, standing or parking would obstruct the flow of pedestrians or other lawful traffic upon any sidewalk;

Can someone explain why DPW refuses to ticket these scofflaws? People report blocked sidewalks all the time, parking enforcement shows up, determines it's "no violation" and leaves. Clearly the law states otherwise.