NC CDL General Knowledge Practice Test

A yellow traffic sign primarily indicates caution or a warning. This color alert signals to drivers that they should be aware of potential hazards or changes in road conditions ahead. For example, yellow signs can inform drivers of curve warnings, pedestrian crossings, or construction zones, prompting them to slow down and stay vigilant. The other options pertain to specific traffic signs: a stop sign generally has an octagonal shape and is red, indicating that drivers must come to a complete stop. Speed limit signs are rectangular and specify the maximum legal driving speed, while one-way signs are also rectangular but designate the direction in which traffic is allowed to flow. Therefore, a yellow sign distinctly serves the purpose of caution and warning, aligning with the need for drivers to adjust their behavior for safety.