What is happening when an emergency vehicle with lights and sirens operating turns them off and slows down?

Occasionally, you may see a fire truck or an ambulance that was responding to an emergency call suddenly turn off their lights and sirens. This can happen when another unit arrived on scene and determined there was no need for other emergency vehicles, or when a dispatcher notifies responding units that the call is no longer an emergency (such as a false alarm with a fire alarm system). The Trophy Club Fire Department does not use our lights and sirens unless we are actively responding to an emergency call for service.   

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1. What should I do when I’m driving and an emergency vehicle with lights and sirens operating is behind me?
2. Why does a fire engine come when I call 911 for an ambulance?
3. What is happening when an emergency vehicle with lights and sirens operating turns them off and slows down?
4. How should I dispose of unused prescription medicines?
5. How come I see firefighters shopping at the grocery store?
6. What does a firefighter do when they aren’t responding to emergency calls?
7. What type of fire extinguisher should I purchase for my home?
8. What should I know about smoke alarms?
9. What does it mean when my smoke alarm is chirping every minute or so?