What does a rectangular sign that says DO NOT PASS indicate?

The sign that states "DO NOT PASS" is a critical traffic control measure indicating that drivers are not permitted to overtake or pass any vehicle traveling in the same direction. This restriction is usually placed in areas where it is deemed unsafe to pass, such as on curves, hills, or areas with reduced visibility, ensuring the safety of all road users.

By adhering to this sign, drivers prevent potentially hazardous situations that could arise from attempting to pass when sightlines are limited or due to the presence of oncoming traffic. Understanding the implications of this sign is vital for maintaining safe driving practices and for complying with traffic laws designed to protect all vehicle operators on the road.