How long should the handle for a flag be according to standard practices?

The standard practice for flag handles typically specifies that they should be 12 inches in length. This length is considered optimal for several reasons, including ensuring adequate control and visibility while allowing the flagger to perform their duties effectively. A 12-inch handle provides a balance between ease of handling and the ability to maintain a safe distance from moving traffic, which is crucial for the flagger's safety.

Using a handle of this length allows for better maneuverability and reduces the risk of the flagger being too close to vehicles, thereby enhancing overall work zone safety. The other options either provide handles that are too short or excessively long, which may compromise control or increase the risk of accidents in a busy work zone environment. Thus, the 12-inch handle aligns with safety best practices in work zones managed by flaggers.