When you hear a loud siren and see bright flashing lights, it means a fire truck is on its way! Fire trucks are special vehicles that help firefighters get to places quickly when there is a fire or an emergency. The siren makes a loud sound so that people can hear it and will quickly move out of the way. The flashing lights help everyone see the fire truck, even if it's dark outside.
The fire truck needs to get to the emergency as fast as possible. Imagine if there was a big fire, and the firefighters want to put it out to keep people safe! So when you hear that siren and see those lights, it’s a sign that help is coming!