A hydraulic transmission comprises a hydraulic pump and a hydraulic motor, which are mounted onto a center section to be fluidly connected to each other through a closed fluid circuit formed in the center section. User input to the steering mechanism causes the cables to turn the first set of wheel assemblies about a vertical axis. Each of the chip stacks includes two or more chips, each chip being inside vertical projection of at least another chip in the chip stack and disposed in a respective chip layer. The status of the respective subsystem can then be determined from the spread spectrum data communications signal. The lamp is distinguished in that it has a focusing element, which lies in the light path of the light emitted via the light exit surface, and extends thereby over the entire length of the light exit surface, and is configured to reduce the beam width of the light bundle in which the light emitted from the light exit surface is propagated.