This pentagon-shaped sign means you are near a school and need to watch for children.

Explanation

School Zone. Five-sided sign back on yellow is used only to warn of schools and school crossings. Slow down – school zones have a speed limit you must observe. Watch out for children crossing the street or playing. Be ready to stop. Obey signals from any crossing guards. New fluorescent yellow-green signs may also be used. You are near a school. Slow down, watch for children, and prepare to stop suddenly if necessary.