What does this traffic sign indicate?

The traffic sign you see indicates the route for tram line U3. This is a specific sign used to direct drivers and pedestrians to the appropriate tram line, ensuring that they know where to go for public transportation.

In Germany, clear signage for public transport routes is essential for helping individuals navigate the cities efficiently and safely. The use of a yellow background and a clearly marked line number makes it easily recognizable for those who need to use the tram system. Noting the correct tram line is important for passengers to ensure they are headed to their desired destination.

Understanding these signs is part of being aware of traffic regulations and the available public transport in urban areas.