Children Run Away Quickly ! Giant Koala's Will Catch You ?

Where would you see a sign like this?
What does it mean?
What should people do if they see a sign like this?
Click on the picture to find out more about koalas.

Tim:

I am a talking sign. My job is to tell people to watch out for koalas and children. Thank you.

Eleanor:

Hi. I'm a talking sign. My job is to tell cars to watch out for koalas and children.

Daniel:

Hello. I am a double sign. My job is to tell you about being careful because of the koalas and their babies and children, when driving. Thank you.