Sharing information
I observed one child who was watching the others creating structures in the center. On one side stood a newly modeled zoo and nearby, a group of boys were creating a building with a railroad track on the top of it. They were experimenting with the speed in which the trains could maneuver on the track without falling off. She processed this information and independently created this informational sign.
(Do not drive here because there are animals)
This child is beginning to understand that signs can represent more than labels and names. They can provide others with important information and instructions.