To ensure effective flagging, what must flaggers wear during the day?

For effective flagging, it is essential for flaggers to wear high-visibility clothing during the day. This type of clothing is designed to be easily seen by drivers and other workers in the vicinity, which is crucial for maintaining safety in work zones. High-visibility clothing typically includes materials that reflect light and have bright colors, such as fluorescent yellow, green, or orange.

Wearing high-visibility clothing helps ensure that flaggers stand out against various backgrounds, particularly in outdoor environments where visibility can be compromised by factors such as sunlight or nearby construction materials. This visibility not only aids in alerting drivers to the presence of a flagger but also communicates important traffic control messages effectively.

The other options, such as reflective hats or non-reflective clothes, do not provide the same level of visibility and safety that high-visibility clothing offers. Dark clothing would further reduce visibility, creating a potentially hazardous situation for both the flagger and the drivers passing through the area.