Final answer:
A person holding a flag down with flag pole point down indicates that the driver should stop. This signal is used for traffic control and the safety of emergency responses.
Step-by-step explanation:
When a person holding a flag with the flag pole point down signifies that the driver should stop. This is a common signal used in situations where traffic must be controlled for safety reasons, such as near accidents, construction zones, or among emergency response activities. It is crucial for drivers to be aware of such signals to prevent accidents and to enable emergency vehicles to move through intersections safely.