Which of the following indicates a hazard on the road ahead?

A warning sign is specifically designed to alert drivers and motorcyclists to potential hazards or changes in road conditions ahead. These signs often feature yellow or orange backgrounds and are shaped in a diamond or rectangular form. Their primary function is to provide information that can help drivers anticipate and respond to situations that could pose risks, such as sharp turns, road work, or animal crossings.

In contrast, other signs like solid yellow lines primarily indicate traffic rules for lane usage, speed limit signs establish legal speed limits, and stop signs instruct drivers to come to a complete stop. While important for safe driving, these signs do not convey the same urgent warnings about potential hazards that could lead to accidents or require immediate caution. Thus, a warning sign is the most fitting choice for indicating a hazard on the road ahead.