No later than August 1, 2016, legislative council staff, with the cooperation of the department, shall prepare and present to the transportation legislation review committee a research study of the commission districts established in section 43-1-106 (2). The study must document changes since the last time the general assembly modified the number and boundaries of the commission districts, including changes in population, number of lane miles, and annual vehicle miles traveled for each of the districts and must take into account existing county and municipal boundaries, regional transportation authorities and districts, and transportation planning regions.