(605 ILCS 5/9-125) (from Ch. 121, par. 9-125)
    Sec. 9-125. The appropriate highway authorities shall seasonably prosecute for all fines and penalties provided for in this Code for violations committed on highways under their respective jurisdictions.
    Whenever any person complains of a violation of this Code to the highway authority that has jurisdiction over the particular highway where the violation of this Code is alleged to have been committed, such highway authority shall proceed to investigate as to the reason for such complaint and, if the complaint is found to be just, shall at once proceed to prosecution of the offender.
    In case the highway authority fails to prosecute, complaint may be made by any person before any court of proper jurisdiction.
(Source: Laws 1959, p. 196.)