No entry sign

Quick answer：

The No entry sign is a traffic control sign that indicates a road or area is closed to vehicle traffic. It is typically used to restrict access to certain roads, intersections, or areas for safety, maintenance, or other reasons. These signs are designed to be visible and clear to drivers, often featuring bold, red letters that say 'NO ENTRY' in white on a contrasting background. In some regions, there may be additional symbols or text to provide more specific information.