crossing guard
A crossing guard is a traffic management personnel who is normally stationed on busy roadways to aid pedestrians. Crossing guards are known by a variety of names. "Crossing guard" is the most common American and Canadian term while the most widely used in the United Kingdom, Ireland and Australia being "lollipop lady/man" (a reference to the large signs used that resemble lollipops) and in New Zealand as "school road patrol".
Most often associated with elementary school children, crossing guards stop the flow of traffic so pedestrians may cross an intersection. Often wears a high-visiblity vest and may hold a flag or stop sign.