The city street department, with reference to traffic-control signs, signals, or markers owned by the city, is authorized to indicate the ownership of the signs, signals, or markers in letters not less than 3/8 inch, or more than 3/4 inch in height, by use of a metal stamp, etching, or other permanent means. Except for employees of the city street department, police officers, contractors and their employees engaged in a highway construction contract or work on the highway approved by the city, it is unlawful for any person to possess a sign, signal, or marker so identified.
(ILCS Ch. 625, Act 5, § 11-313) Penalty, see § 70.999