31 CFR § 407.12 - Vehicular and pedestrian traffic.
(a) Drivers of all vehicles in or on the property shall drive in a careful and safe manner at all times and shall comply with the signals and directions of Treasury guards and all posted traffic signs.
(b) The blocking of entrances, driveways, walks, loading platforms, or fire hydrants in or on the property is prohibited.
(c) Parking in or on the property is not allowed without a permit or specific authority. Parking without authority, parking in unauthorized locations, or in locations reserved for other persons, or contrary to the directions of Treasury guards or posted signs is prohibited.
(d) This section may be supplemented from time to time with the approval of the Assistant Secretary for Administration, or his delegate, by the issuance and posting of specific traffic directives as may be required and when so issued and posted such directives shall have the same force and effect as if made a part hereof.