Fluorescent yellow-green signs are used to warn about what kind of areas?

Fluorescent yellow-green signs are specifically used to indicate areas that are related to pedestrian safety, particularly in school zones. These signs serve to draw attention to locations where there could be increased foot traffic due to children arriving or departing from school. The use of this bright, highly visible color is intended to alert drivers to the potential presence of children, thereby encouraging caution and lower speeds in these areas.

In contrast, while traffic control signs are used for directing traffic flow and regulatory measures communicate rules that must be followed, they do not utilize the fluorescent yellow-green color. Motorist services signs typically provide information about available services to drivers and are not concerned with the same type of safety message that school zones represent. Therefore, the use of fluorescent yellow-green signs is explicitly tied to school safety zones, making this the correct answer.