The "Do Not Enter" sign is a traffic control device used to indicate that vehicles are prohibited from entering a specific area. This sign is typically placed at the entrance of one-way streets, construction zones, or restricted areas to prevent accidents and ensure safety. It features a red circle with a white horizontal bar, making it easily recognizable. When drivers see a "Do Not Enter" sign, they should stop and turn around to avoid entering a dangerous or restricted zone. Ignoring this sign can lead to traffic violations, accidents, and potential legal consequences. Following these signs helps maintain order on the roads and protects both drivers and pedestrians.