Which sign is likely to provide information about upcoming road conditions?

The choice indicating a warning sign is correct because warning signs are specifically designed to alert drivers to potential hazards or changes in road conditions ahead. These signs often use yellow or orange colors and may include symbols or messages that inform drivers about sharp turns, slippery roads, upcoming intersections, or other conditions that require attention and caution.

In contrast, stop signs and yield signs are regulatory signs that govern right-of-way and stopping behavior at intersections, while speed limit signs communicate the maximum allowable speed on that road but do not inform about upcoming conditions. Therefore, when considering which sign conveys information about changes or potential issues on the road ahead, warning signs are the clear choice.