Visit https://www.openstreetmap.org/way/27852990 to see an example of a raceway. Now show the same area in Marble in the Vector OSM map theme on tile level 17 (close zoom). Note how the raceway is not shown, while other ways in that area are shown. The goal of this task is to extend the Marble source code to extract the information of raceways and render them like other ways. Compare earlier commits like this one where OSM features were introduced to get an idea which places of the source code you need to edit (hint: not too many changes are needed, but they are spread across a couple of files).