Parking Rules (excerpts)

Section 31-20 (Montgomery County Code)
Except when necessary to avoid conflict with other traffic or in compliance with law or the directions of a police officer or official traffic-control device, no person shall:
(b) Stand or park a vehicle, whether occupied or not, except momentarily to pick up or discharge a passenger or passengers:
(1) In a direction other than the flow of traffic...

Section 31-14
It shall be unlawful to park any commercial vehicle or bus on that side of any public road abutting any private residence, apartment house, church, school, hospital or playground except when such vehicle is actually engaged in loading or unloading passengers, merchandise or materials, or when used by the owner or operator actively engaged in work on the premises ...