Sometimes I see fire apparatus with lights and siren in operation proceeding through intersections and then after they go through they turn off their lights and slow down?
When several fire units are dispatched to the same incident, the first units that arrive may have assessed or "sized-up" the situation and determined it is under control and/or the Fire Department is no longer needed. All other responding units are subsequently cancelled and returned to service. Therefore, when you see an emergency vehicle proceeding lights and siren through an intersection and then slow down and turn off their lights, they have probably been cancelled from the call they were going on.

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1. Why do firefighters break out windows and cut holes in a roof during a fire?
2. Why do firefighters block traffic lanes at motor vehicle accidents and more lanes than are necessary?
3. Sometimes I see fire apparatus with lights and siren in operation proceeding through intersections and then after they go through they turn off their lights and slow down?
4. Why does my water turn brown when firefighters turn on fire hydrants?
5. Why do firefighters shop at the local grocery stores?
6. Why are smoke detectors so important?