As you are talking about rendering of the roads. I am actually looking at this for the new cartoCSS mapnik style for osm.org. Currently we have several omissions in the mapping for level 18. I think 'all' roads just use the width for the level17 zoom. This is unrealitisic and misleding. I am working on 'correcting' this for level18 and tidying up all other zoom levels. There are many enhancements to be gained.
Also relating directly to this I am looking add lanes too. So the width of the rendered roads will reflected by the amount of lanes. So a 8 lane motorway will have a thicker line width that will much better reflect the real world and give the more instant graphical impression of major roads on all/many zoom levels. But early days so far to get the rendering looking right and the complexities of the tunnels, bridges, construction tags for these ways and what to do/look best when, for example, 8 lane road split into two 3 lane roads. Maybe even show in the rendering road markings for the lanes..... But the biggest task I feel will be trying to getting to any change anything on osm.org.....:( But I am going more off topic. Hopefully rendering the examples in this thread will be improved in the future. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging