(2) The department is vested with power and jurisdiction to supervise and regulate every motor carrier and railroad in this state, and to do all things necessary and convenient in the exercise of such power and jurisdiction.
(3) The department may participate in any proceeding before any public officer, commission or body of the United States or any state or other jurisdiction for the purpose of representing the public generally and the customers of the services of any motor carrier or railroad operating or providing service to or within this state.
(4) The department may make joint investigations, hold joint hearings within or without this state and issue concurrent orders in conjunction or concurrence with any official, board, commission or agency of any state or of the United States. [1995 c.733 §15; 1997 c.275 §9]