Which of the following colors means caution and is used to indicate physical hazards such as tripping hazards in ANSI Z535.1?

The color associated with caution in ANSI Z535.1 is yellow, which signifies a need for alertness regarding potential physical hazards. This includes situations where there could be tripping hazards or other dangers that may cause injury if not heeded. Yellow serves as a visual warning to ensure individuals remain vigilant and take necessary precautions.

In the context of safety signage, yellow is well-recognized for its high visibility and its effectiveness in conveying cautionary messages, making it an ideal choice for indicating areas or conditions that require careful attention.