36 CFR § 7.64 - Petersburg National Battlefield.
(b) Maintenance of vehicles. Washing, cleaning, waxing, or lubricating motor vehicles or repairing or performing any mechanical work upon motor vehicles, except in emergencies, in any public place is prohibited.
(c) Definition. As used in paragraphs (a) and (b) of this section, the term “public place” shall mean any place, building, road, picnic area, parking space, or other portion of Petersburg National Battlefield to which the public has access.