70 ILCS 3605/42

The Board may investigate all means of transportation and the management thereof, the enforcement of its ordinances, rules and regulations, and the action, conduct and efficiency of all officers, agents and employees of the Authority. In the conduct of such investigations the Board may hold public hearings on its own motion, and shall do so on complaint or petition of any municipality which has adopted this Act or which has granted rights to the Authority by ordinance.