What does this traffic sign mean?

This traffic sign is a special type of crossbuck used at railway crossings with overhead electrical wires.

1. It indicates the presence of overhead electrical wires, warning drivers and pedestrians to be cautious of electrical hazards above.

2. Rail traffic always has priority at this crossing, meaning you must give way to trains or trams.

3. If a rail vehicle is approaching, you must always wait and not try to cross the tracks until it has passed and it is safe.

This sign combines the usual "give way to rail traffic" rule with the additional warning about electric wires, so safety involves awareness of both moving trains and electrical danger.