Is it true that the police/fire/ambulance can change traffic lights on the fly? Can they push a button that immediately turns the red light green? - Quora
![Office of the Fire Marshal on Twitter: "Ontario drivers know when they see/hear emergency red flashing lights & sirens on police cars, ambulances & fire trucks, they are required by law to Office of the Fire Marshal on Twitter: "Ontario drivers know when they see/hear emergency red flashing lights & sirens on police cars, ambulances & fire trucks, they are required by law to](https://pbs.twimg.com/media/FZ-KRWDXkAE2XJf.jpg)
Office of the Fire Marshal on Twitter: "Ontario drivers know when they see/hear emergency red flashing lights & sirens on police cars, ambulances & fire trucks, they are required by law to
![Emergency-Life.com on Twitter: "🇦🇺 Little green lights appearing over the license plates of some Australian Ambulances: do you know what they are? https://t.co/I3cVZIN45K" / Twitter Emergency-Life.com on Twitter: "🇦🇺 Little green lights appearing over the license plates of some Australian Ambulances: do you know what they are? https://t.co/I3cVZIN45K" / Twitter](https://pbs.twimg.com/media/CUx4cjUUcAA14tM.jpg)