44 Ill. Adm. Code 5040.320
License Plates
Section 5040
Section 5040.320 License
Plates
a) Each vehicle, except as otherwise provided in this Section,
shall display valid Illinois license plates that are distinct from plates
issued to the general public.
b) Conventional plates will be issued as allowed by law (see the
State Vehicle Identification Act [30 ILCS 610]) and when necessary to meet
operational needs.
c) All requests for conventional plates must be justified by the
requesting agency head and approved by CMS. Requests will be granted upon a
showing of the following:
1) The agency head details why the conventional plate is
necessary for the operations of the agency and how it complies with the
referenced statute.
2) The agency head must certify that the vehicle bearing the
conventional plate will be used substantially full-time in functions requiring
the conventional plate. Occasional needs should be satisfied by private
vehicle rental.