Located in the city of Hamburg the unique design of the new roof for the central bus station ZOB will be a landmark with its own cooperate identity. The arrangement of the bus-pockets led to the significant and individual half-moon shaped geometry of the roof. Like an huge boomerang almost 200 m long, the roof hovers above the service buildings and the entire bus-stations. The roof structure is supported 12 m above ground by a colonnade of slender steel columns, following the curvature of the multi-rib steel shell structure that carries the cantilever beams. Transparent glass panels are fixed underneath the steel purlins spanning between the filigrane cantilevers. This article describes the structural design, the structural behaviour and selected highlights of the fabrication and erection.