I hope no one minds me revisiting this thread that seems to have run its course, but I recently came across a booklet on the history of Illinois license plates, and thought I share some pertinent information here.
1941 - Illinois creates their For Hire class, consisting of taxis, livery cars, funeral home vehicles, and ambulances. These license plates look just like every other license plate, the only thing that makes them for this class of vehicle is that they have a '0' (zero) as the first digit in the number.
1972 - The For Hire class is broken up into separate taxi, livery, funeral home, and ambulance license plates. The '0' number use is discontinued, and plates receive either AMB, FH, TAXI, or LIVERY.
1982 - The ambulance plate is redesigned. The AMB letters are discontinued, and the word AMBULANCE now appears on the plate. The ambulance plate also discontinues the use of a random number. There are now three separate numbers on the plate. The first number is the emergency medical service region of the state in which the ambulance operates, the second number is the ambulance company's registration number with the state, and the third number is the unit number in the ambulance company's fleet.
1990 - A Medi-Car plate, using the letters MC is introduced for vehicles engaged in the non-emergency medical transportation.
Now for some miscellaneous information that some here might find interesting:
1907 - Illinois registers cars for the first time. Motorists receive an aluminum round disc to mount on the dashboard, and are required to supply their own license plates.
1911 - The first state issued license plates are introduced.
1917 - The last year Illinois issues dashboard discs along with license plates.
1948 - Illinois creates the Manufacturer license plate, with Manufacturer plate number 1 going to the Tucker Corporation of Chicago.
1949 - First year for an antique vehicle plate, which is called a Horseless Carriage plate.
1961 - Having run out of numbers, Illinois begins using both letters and numbers on their plates.
1968 - First year for a Police plate. The Horseless Carriage plate becomes the Antique Vehicle plate.
1985 - The Tow Truck plate is introduced. (Just for you, Rick Franklin
)
Here is a photo of a couple of the plates in my collection. The photo shows a set of the 1975 For Hire plates except for a Taxi plate, as well as the current design for Ambulance and Funeral Home license plates.