What does a "Do Not Enter" sign indicate?

A "Do Not Enter" sign specifically indicates that drivers are approaching a road or area where entry is prohibited. This sign is typically placed at locations where vehicles should not enter, such as one-way streets or areas that may pose hazards if entered. When you see this sign, it serves as a clear directive to turn around and find an alternative route, ensuring safety and proper traffic flow.

The other options serve different purposes or convey other types of instructions. For example, the suggestion to slow down and proceed with caution is more aligned with warning signs indicating potential hazards or changes in road conditions. Stopping is often required at stop signs or traffic signals, but a "Do Not Enter" sign does not require a full stop, only that a driver does not proceed into that area. A sign denoting one-way traffic only typically indicates allowed movement in a specific direction, which does not match the direct prohibition of entering that the "Do Not Enter" sign communicates.