[mkgmap-dev] motorway_link not always oneway

Tue Oct 26 19:38:40 BST 2010

On Tue, Oct 26, 2010 at 05:17:50PM +0200, Torsten Leistikow wrote:
>As a consequence, I think we shouldn't assume one=yes as default for 
>motorway_links.

For what it is worth, when this was discussed last time, most 
highway=motorway_link in Finland were tagged oneway=yes. Some were 
tagged oneway=no, and some were missing a oneway attribute. I added 
oneway=yes or oneway=no to each motorway_link in Finland that was 
missing it. I invite you to do the same in your country or region. You 
can easily do that by extracting the ways from a country or state 
extract with Osmosis and loading the resulting file to JOSM. In JOSM, 
you can download some surroundings around each line in order to 
determine whether it should be oneway=yes or oneway=no. Here is a sample 
command:

osmosis --rb extract.osm.pbf \
--tf accept-ways highway=motorway_link \
--tf reject-ways 'oneway=*' \
--tf reject-relations --used-node \
--wx motorway_link.osm
josm motorway_link.osm

I still do not think that the default style should be changed in this 
respect, but I don't have a strong opinion, as my "own territory" would 
be unaffected. I just checked that the above command produced an empty 
file (just the bounding box). When I replaced the oneway=* with 
surface=* (I guess many mappers do not bother to set surface=paved on 
motorways) I did get a number of ways.

	Marko