What does a yellow diamond sign with a pedestrian symbol mean?

A yellow diamond sign with a pedestrian symbol means pedestrian crossing ahead.

The sign is a warning, not a command to stop and not a guarantee that pedestrians are currently in the road. It tells drivers to reduce speed, watch for people walking, and prepare for a crossing or other pedestrian activity ahead. The yellow diamond shape is part of the US warning-sign system, where black symbols on yellow diamonds identify hazards or conditions requiring extra attention.

Drivers sometimes confuse this sign with a crosswalk marking. A crosswalk is the actual area where pedestrians cross, commonly marked with parallel white lines or other pavement patterns. The warning sign is positioned in advance so drivers have time to react. A separate regulatory sign, signal, beacon, or stop or yield control may also be present.

Sign designs vary by jurisdiction, and some modern pedestrian warnings use fluorescent yellow-green backgrounds for greater visibility. Regardless of the color variation, the walking-person symbol communicates that pedestrians may be crossing or entering the roadway ahead.