(a) Drivers of all vehicles entering, leaving or while on GAO property or in the GAO Building shall drive in a careful and safe manner at all times and shall comply with all posted traffic signs and with the signals and directions of the guards, security staff, or other authorized individuals;

(b) The blocking of entrances, driveways, walks, loading platforms or fire hydrants on GAO property is prohibited; and

(c) Except in emergencies, parking on GAO property or in the GAO Building is not allowed without a permit. Parking in unauthorized locations or in locations reserved for other persons, or parking contrary to the direction of posted signs or instructions of guards is prohibited. Vehicles parked in violation of posted restrictions or warning signs shall be subject to removal at the owners' risk and expense.

(d) The Comptroller General or his designee may supplement this paragraph from time to time by issuing and posting such specific traffic directives as may be required. When issued and posted, such directives shall have the same force and effect as if made a part hereof. Proof that a motor vehicle was parked in violation of these regulations or directives may be taken as prima facie evidence that the registered owner was responsible for the violation.