625 ILCS 5/12-815.2: Noise suppression switch.

Any school bus manufactured on or after January 1, 2006 must be equipped with a noise suppression switch capable of turning off noise producing accessories, including: heater blowers; defroster fans; auxiliary fans; and radios. For the purposes of this Section, radios shall not include 2-way radios which transmit Global Positioning System (GPS) location and record metadata stops.