The fascists dictate how, when and why you park; control your own destiny. As it is commonly accepted by prominent historians, such as Billy Nye, strict parking regulations inevitably leads to the formation of an anarchist state, such as the People's Democratic Republic of Archenland. It is only by going against the status quo of conforming with the oppressive rule that individuals can maintain their inherent right of being able to park without their beloved state falling into tyranny.
To the best of my knowledge, the restriction of commercial vehicles allowed on NY parkways doesn't include vans that do businesses, such as plumbing. This restriction refers to weight restrictions regulated by the department of transportation and vehicles that are making deliveries to loading docks as opposed to front end deliveries like mail.
There is a reason for disallowing commercial vehicles from specific parkways, however this does not include all commercial vehicles period, but rather vehicles that are hauling products. This does not include service vehicles such as vans for businesses that perform services for various types of business and residential clients. Service vehicles, while commercial in nature are not excluded, as they often need to use these parkways to reach clients.