625 ILCS 5/3-814.3

Registration of fleets of semitrailers or apportionable semitrailers. The Secretary of State may provide for the registration of large fleets of semitrailers or apportionable semitrailers by accepting the appropriate fees and issuing the registration plate or digital registration plate prior to the plate being assigned to a specific vehicle. The registration indexes will be updated on a date predetermined by the Secretary of State. In determining this date, the Secretary of State shall take into consideration the number of vehicles in each fleet.