What does this road sign mean?

A stop sign means that you must come to a full stop and yield the right-of-way to vehicles and pedestrians in or heading toward the intersection. Go again when it is safe.

• Slow down and prepare to stop if cars are approaching you.
• Come to a full stop and go when it is safe to do so.
• Proceed carefully through the intersection, not always stopping.
• Stop only for traffic on an intersecting road.