> versus implying it to be oneway=no, there's *probably* a > reduction in > the amount of tagging needed, because there are probably more > ways with > motorway_link that are oneway=yes than oneway=no. In addition, > for a > routing application it increases safety. It's a lot worse to > route > someone the wrong way up a one-way motorway_link because it was > assumed > to be two-way than it is to send someone on a longer/slower > route > because it was assumed to be one-way.
There are a lot of "probably"s there. Based on the fact that there already a lot of motorway_link's in the database, some of which are 'probably' already explicitly tagged, perhaps it is best to use explicit tagging, and let the routing software make it's own assumptions about whether to use a motorway link without explicit tagging or not. The oneway tags, especially if =yes) should be stated explicitly, whether we are tagging for routers, renderers or just mapping what is there... Anyway, if a motorway_link only links from a twoway road to a oneway motorway way there will be no use routing down it anyway. Do people actually add oneway roads and forget to tag them as such? Ed _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk