A yellow flag may refer to:
- A yellow flag, historically displayed on ships to indicate the presence of infectious disease or quarantine, is also used in some cities to mark a recent death in a neighborhood, regardless of the cause.
- A yellow flag, or caution flag (in racing), universally requires drivers to slow down due to a danger on the track, usually an accident, a stopped car, debris, or light rain.
- A yellow flag, or "penalty flag" (sports), is used to indicate the location of penalties and violations in various sports, including American football.
- A yellow flag, like a yellow traffic light, is used to keep everyone cautious. For example, if you see a yellow flag on a beach, even if you are an expert swimmer, you have to be more careful than normal in the water.
- A yellow flag means "proceed carefully" on the railroad.
Also, yellow is a primary color. It is a color often associated with sunlight or joy. Children tend to like this color, which is used to market products to children. It is also used for school buses and taxi cabs, as it is a bright and noticeable color.
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