The General Assembly finds that transportation districts that (i) have a population of 1.7 million or more, as shown by the most recent United States Census, (ii) have not less than 1.5 million motor vehicles registered therein, and (iii) have a total transit ridership of not less than 75 million riders per year across all transit systems within the transportation district and in which a rapid heavy rail commuter mass transportation system operating on an exclusive right-of-way and a bus commuter mass transportation system are owned, operated, or controlled by an agency or commission as defined in § 33.2-1901 have unique transportation needs.