The open space fire aisle may be comprised of any open space or combination of open space on the lot as, for example, yards, vehicle access drives, vehicle maneuvering areas, driveways, sidewalks, unroofed patios, and off-street loading spaces. However, the following features are not permitted in the open space fire aisle: an off-street parking space (irrespective of whether the off-street parking space is outdoors and not covered with a roof), an outdoor swimming pool, or any other feature which would unreasonably obstruct day or night access or egress through the open space fire aisle. [See also § 240-53B(2), (3), (4), (5) and (8)(b).]