(a) Each planning organization shall develop a 10-year transportation plan for the use of the funding allocated to the region. The department shall assist the planning organizations by providing in a timely manner such information as is reasonably requested by the planning organizations.
(b) The first four years of the plan shall be developed to meet the transportation improvement plan requirements of 23 U.S.C. § 134 or 135, as applicable.

(c) For an area that is not within the boundaries of a metropolitan planning organization, the department district shall develop the 10-year transportation plan with input from municipal and county elected officials and transportation officials in the region.