IL State Police tend to run concentrated enforcement details on various Interstates at varying times. I have seen several on I-57 thru District 21 (Ashkum, the Kankakee area) and District 10 (Pesoutom, the Champaign area). They will gather 10 or 20 troopers and run bith directions with chase cars with either air or ground units calling out the violators.
42.50, 155.460 and and local district channels are all used for these details.