Yes, it is the law in Illinois that traffic in BOTH directions must stop for a school bus displaying its stop sign, deploying its pole, and flashing those red lights. The pole, however, only extends across one lane of traffic, and motorists on stroads have lots of other clues that they are on effectively a limited-access highway and ought behave accordingly.
Never mind the hazards to school kids (but how many schools are laid out as if on the ground plan for a shopping mall, with a campus complete with a parking crater, a bus boarding area, and traffic jams for parents dropping off and picking up kids) and to residents along College Drive. "[Citizen journalist Eren Evers] said it’s dangerous to even pick up your mail at the curb." Yes, because Palos Heights was Intelligently Designed that way.
Yes, Palos Heights can assign additional police to the school zone, and shadow the school buses, but the problem is not one to lay off on Illinois drivers alone, tempting though that is. To slow the cars, rethink College Drive.