Setra Double-Decker Bus Has Got Some Unique Features  Daimler is now showing off with its Setra double-decker. The model is pretty spacious inside and it has also got enhanced aerodynamics. Setra double-decker is dubbed S 531 DT and it looks like a fancy box with an amazing design. The bus has also got this unique Viola Pyxis color. It is 14 meters...