The Monav data page for Marble has a lot of Motorway/Pedestrian maps. Some may be slightly outdated. They can be found here http://files.kde.org/marble/monav/2012-w29/

These do not follow the folder structure as that of Monav/Modrana, so you might have to create the folder structure and copy the Contraction hierarchies and GPSgrid files to the relevant routing folders.