Are these signs important?

Last week we read an article about a family of boys who went on a ferry and noticed that there were signs EVERYWHERE!
We then had a look around our school for signs and took some photos of them. 

I made a DLO which signs are not important. I put the pictures on the important side because it says be active keep learning give notice. I also put the hay park way picture on the important side because its a sign that is telling you to be respectful and resilient and responsible. The water meter is important because we need water for the world or else the turtles and fish wont be able to breath. The password sign is very VERY important because if someone hacks your Chromebook you will lose everything in your account and you will have to make a new one. Do you agree? Or do you think these signs are not important?