I do not know if this is what is going on in your Illinois town? But in this down economy perhaps some local planning trustees are attempting to create revenues through stepped up efforts to get all cars tagged or to get those not properly tagged cited with tickets.
Check to see if the town council has tried to apply rules on abandoned, nuisance, and junked cars in such an effort.
Just a suggestion....
NOTE: This answer is made available by the lawyer for educational purposes only. By using or participating in this site you understand that there is no attorney client privilege between you and the attorney responding. This site should not be used as a substitute for competent legal advice from a licensed professional attorney that practices in the subject practice discipline and with whom you have an atttorney client relationship along with all the privileges that relationship provides. The law changes frequently and varies from jurisdiction to jurisdiction. The information and materials provided are general in nature, and may not apply to a specific factual or legal circumstance described in the question.