The visual signal specified under this subsection (c) given by an authorized emergency vehicle is an indication to drivers of approaching vehicles that a hazardous condition is present when circumstances are not immediately clear. Drivers of vehicles approaching a stationary emergency vehicle in any lane shall heed the warning of the signal, reduce the speed of the vehicle, proceed with due caution, maintain a safe speed for road conditions, be prepared to stop, and leave a safe distance until safely passed the stationary emergency vehicle.
As used in this subsection (c), "authorized emergency vehicle" includes any vehicle authorized by law to be equipped with oscillating, rotating, or flashing lights under Section 12-215 of this Code, while the owner or operator of the vehicle is engaged in his or her official duties.
625 ILCS 5/11-907