(a) The term parkway shall include the Robert Moses State Parkway, West River State Parkway and the South State Parkway.

(b) Except as provided in subdivisions (c) and (d) of this section, the use of parkways is restricted to vehicles registered as passenger vehicles by the Commissioner of Motor Vehicles, excluding, however, such vehicles when adapted to or used for the carrying of commercial goods or materials. Recreational vehicles, including but not limited to motor homes, self-propelled campers, travel trailers and recreational equipment are permitted on parkways under the jurisdiction of the office the First Park Region.

(c) The use of all commercial, industrial and farm vehicles on parkways under the jurisdiction of the office in the First Park Region is prohibited, except that any vehicle with a commercial license plate equipped with recreational equipment and buses will be permitted on a parkway, providing the immediate destination is a park facility under the jurisdiction of the office, and also except where the office determines an immediate emergency exists and it is in the best interests of the public to temporarily use such parkway until the emergency subsides.

(d) Nothing contained in this section shall apply to the trucks and apparatus of a fire department, police department or ambulance, or to emergency repair wagons, when reporting for emergency work in case of fire, accident, public disaster or impending danger or emergency on the parkways or in the parks. Licensed ambulances for sick or injured persons shall be permitted to operate over parkways when on emergency service, but subject to all the provisions of the section regulating traffic and including limitations on the rate of speed.

(e) The following are prohibited from using the parkways: pedestrians, bicycles, motorized bicycles including safety-cycles, whizzer bikes and similar types of vehicles; scooters, motorettes and other similar small power-propelled vehicles of two or three wheels, and any vehicle having two or three wheels any one of which has an overall diameter of less than 15 inches, excluding the tire.