How come I see fire trucks with full lights and sirens go through a red light at intersections and then, after they go through, they turn off their lights and slow down?

As explained in the previous answer, sometimes several units are dispatched to the same incident. The first unit may have arrived on the scene, surveyed the situation and informed the dispatcher that the situation was under control. All other responding units were canceled and put back into service, ready to take another call.

Most likely, when you see an emergency vehicle go "Code 3" (lights and siren) through an intersection and then slow down and turn the emergency lights off, they have been canceled from the call they were going on.

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1. Why is a fire engine sent when I call an ambulance?
2. How do I request a tour of a fire station?
3. What if I have a question about my ambulance bill?
4. What is the best kind of fire extinguisher for my house?
5. Can a fire engine visit my children's school?
6. Why does the Fire Department tear open walls, when it seems there is no fire in the room?
7. Who do I call if I have problems with bees?
8. Why do so many fire apparatus respond to simple incidents?
9. How come I see fire trucks with full lights and sirens go through a red light at intersections and then, after they go through, they turn off their lights and slow down?