What is indicated by a "do not pass" sign?

A "do not pass" sign indicates that you must not attempt to pass another vehicle where the sign is posted. This sign is placed in areas where visibility is limited, where there may be hazards, or where the road conditions make passing unsafe for all vehicles involved. By obeying this sign, drivers help ensure the safety of themselves, other drivers, and pedestrians, as passing in these areas can lead to dangerous situations, such as head-on collisions or running into obstacles.

The other options do not accurately reflect the meaning of a "do not pass" sign. For instance, the notion of passing with caution contradicts the essence of the sign, while indications of two-way traffic and road closures do not pertain to conditions regarding overtaking vehicles. Understanding the importance of this sign is crucial for maintaining road safety and adhering to traffic regulations.