A novel three-vaned, drag-type wind turbine, wherein air, when it exits a first vane, is split into two flow paths. The vertical plates are inserted respectively into the engaging grooves; in this way, the communication module can be fast assembled. An integral risk potential is calculated for the road segment on the basis of the sum of the specific risk potentials of all detected risk elements. These conductive traces are coupled together about the magnetic component with conductive vias.