Who is allowed to enter a street sign-posted like this?

The sign shown indicates a restricted access area, commonly used in Germany. The additional text "Anlieger frei" means "Residents allowed." This sign allows entry only to specific groups—namely:

1. Residents of the area.
2. Visitors to those residents.

Through-traffic is not permitted, which helps reduce congestion and ensures that the street remains safer and quieter for those living there. Adhering to this restriction is essential for maintaining local traffic flow and safety. Understanding this sign helps drivers know who is allowed access and why these regulations are in place.