What does a yellow traffic sign mean?

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Yellow signs are warning signs. They alert you to be prepared for something ahead that could require extra caution or a change in driving conditions. They don’t tell you to stop or to follow a specific speed; they signal that there’s a potential hazard so you can adjust your driving accordingly. Saying that there is a special situation or hazard ahead captures the purpose of these signs, since they cover a range of possible hazards you may encounter. For instance, you might see signs warning of curves, merging lanes, or pedestrians crossing. The other options describe actions or conditions tied to different kinds of signs (like a stop sign or a speed-change sign), but the general meaning of yellow warning signs is the presence of a hazard ahead.