Sign name - Beginning of a traffic restriction zone to reduce harmful air pollution in an area.

This sign indicates that you are entering an "Environmental Zone" (Umweltzone) where vehicle emissions are restricted. The aim is to improve air quality by limiting access to certain vehicles based on their emissions standards.

To enter this zone, vehicles must display a specific environmental badge (Umweltplakette) which indicates that they meet the required emissions standards. Depending on the zone's regulations, certain vehicles may be completely banned or allowed only if they meet specific criteria. Make sure your vehicle is compliant before entering such areas to avoid fines.