Why do emergency vehicles run with lights and siren, then just turn them off?

On occasion, the fire engine or ambulance will be driving with lights and sirens and then suddenly turn them off - perhaps only to turn into a shopping center parking lot or side street. Be assured that when this happens it means we have received information through our 911 dispatchers or another unit on the scene that the caller or incident is no longer a dire emergency. It is what we call "being cancelled". Any or all of the apparatus may continue to drive to the call or perhaps some will return to the fire station, but we do not do it just to get to the store faster!

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1. When an emergency vehicle is approaching that is displaying emergency lights and sirens, what should I do?
2. Why do emergency vehicles run with lights and siren, then just turn them off?
3. Can you make the stop lights turn green?
4. What is the difference between an EMT and Paramedic?
5. Do the personnel on the ambulance fight fires also?
6. Why do fire trucks respond to motor vehicle accidents?
7. Why do fire trucks respond to emergency medical calls?
8. Why do so many fire trucks respond to 'simple' incidents?
9. Why do firefighters cut holes in the roof of a building on fire?
10. Why do firefighters break windows in a building that is on fire?
11. How do I get one of those reflective number signs for my mailbox/driveway?
12. Is outdoor burning allowed?
13. Will the Fire Department refill my fire extinguisher?