Except for persons having business directly related to the Administration, or unless otherwise authorized, a person may not park or otherwise place any of the following type vehicles upon MTA parking lots: A trailer or towed vehicle; A truck having a manufacturer's rated carrying capacity greater than 1 ton; A vehicle with a gross weight greater than 8,000 pounds; A vehicle having an overall length more than 20 feet including any load on it; A vehicle wider than 8 feet; A bus.