What is indicated by a yellow sign?

A yellow sign serves as a general warning to drivers, alerting them to potential hazards, changes in road conditions, or upcoming obstacles that may require caution. This color is chosen for its visibility and the psychological response it elicits, signifying caution and awareness. For example, you might see a yellow sign indicating a curve ahead, a pedestrian crossing, or a school zone, all of which guide drivers to adjust their behavior accordingly.

The other options reflect different purposes for road signs: red signs typically indicate prohibitions or required stops; green or blue signs usually provide information about directions to facilities; and signs that mandate action often use shapes like circles or rectangles along with specific colors. Understanding these distinctions helps drivers navigate safely and responsibly, reinforcing the importance of being alert to various signs encountered on the road.