In order to legally drive on public highways within the state of Illinois, there are certain requirements that must be met. For example, you must have updated registration and liability insurance. If you fail to have either of these items you could be charged with what is commonly called a business violation. These are typically fine only offenses.
While you are driving a vehicle on an Illinois roadway, your vehicle must meet certain specifications. The policy here is to avoid endangering other persons and property on the roadway. Some examples of equipment violations are: no tail light, no head light, obstructed rear view mirror, failure to dim head lights or unsecured load.
These types of offenses, while traffic related, are classified as Class A Misdemeanors. As such, they are punishable by up to 24 months court supervision, conditional discharge, or probation; up to 364 days in jail and/or up to $2,500.00 in fines.
In the State of Illinois, a police officer can pull you over for any of the above reasons, even if the officer is only doing it because he suspects you have done something more serious wrong (Illinois Courts refer to this as a pre-textual stop). This is another reason to make sure you are following all the rules of the road!