What does this traffic sign indicate?

The traffic sign you provided indicates that motor vehicles are prohibited. This means that all types of motor vehicles, including cars, trucks, and motorcycles, are not allowed to enter or be present in the zone where this sign is displayed.

This prohibition is typically in place for various reasons, such as protecting pedestrian areas, preventing traffic congestion, or maintaining safety in specific locations (like residential streets or historical districts). Understanding and obeying this sign is important to ensure pedestrian safety and compliance with local traffic regulations.