What does a no-entry sign indicate?

A no-entry sign is a clear and universally recognized traffic control device that indicates to drivers that they are not allowed to enter a specific road or area. This sign is commonly placed at the entrance of one-way streets, dead-end roads, or areas designated for restricted access. Its purpose is to enhance safety by preventing vehicles from entering zones where they could pose a risk to themselves or others, or where traffic flow is specifically regulated.

The other options do not align with the established meaning of a no-entry sign. For instance, suggesting that vehicles are permitted to enter contradicts the fundamental rule that the sign enforces. Likewise, while it may imply restricted access, only a no-entry sign explicitly denotes an outright prohibition on entry. Lastly, the option mentioning access for public transport misrepresents the sign's clear directive against vehicle entry, regardless of type. Thus, the interpretation that the sign prohibits vehicle entry is the only accurate explanation of its intention.