Other
Peaceful Playgrounds: Playground Safety Rules
This article explains the importance for establishing rules. You'll also find guidelines for playground etiquette and safety ideas for various pieces of equipment.
Other
Play It Safe on the Playground: Lesson Plan
This lesson plan provides plenty of activity suggestions for reinforcing playground safety. Although this is designed for primary students, it could certainly be adapted to other grades.
Utah Education Network
Uen: Playground Safety
Through an assortment of stations, students will learn the importance of safety while having fun at a playground.