Okay, imagine there’s a really big fire somewhere, and firefighters need to get there super fast to help! Fire trucks have loud siren sounds that go 'woo-woo' or 'nee-nah!' This noise is like a loud voice that tells other cars on the road, 'Hey, I need to go fast! Please move out of the way.'
Also, fire trucks have flashing lights that blink on and off in bright colors like red and blue. These lights help people see the fire truck coming, even if it’s sunny or dark outside.
So, when you hear a siren or see those colorful lights, it means the firefighters are on their way to help someone. Everyone else on the road knows to let them pass so they can reach the fire quickly and keep everyone safe!