Which color(s) are warning signs generally associated with?

Warning signs are primarily associated with yellow. This color is used because it effectively draws attention and indicates caution to drivers, signaling that they need to be alert for potential hazards or changes in roadway conditions. Yellow is a universally recognized color for warning signs--it conveys a sense of urgency and the need to be vigilant.

In contrast, red is typically used for stop signs and prohibitory signs, conveying a need to stop or be aware of serious dangers. Green is often used for directional signs or to indicate permitted movements, while blue is associated with services and informational signs. Thus, yellow stands out as the correct choice for warning signs, reflecting their purpose in road safety.