The School Bus Warning Sign with Yellow Class 1 Reflective Backing is used to keep children safe when getting on or off the school bus. It is a big, bright yellow sign that helps drivers see the bus and know to be careful.

The sign is placed on the back of the bus so that cars driving behind can see it easily. The sign aims to warn drivers to slow down and stop when they see the school bus picking up or dropping off children. This helps prevent accidents and keeps kids safe to and from school.