IME the plate law only seems to be enforced on parked vehicles in the city of Chicago and O'Hare. I've never received one while moving, and I've lived in suburbs for 4 of the past 5 years within blocks of the police station. I just simply affix a temporary license plate via magnets whenever I need to park on the street in the city.
Of course, they could always use it as an excuse to pull you over for something else, or slap you with an extra $50 ticket if you get pulled over.
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