On 10/26/2010 06:17 PM, Torsten Leistikow wrote:
I checked some examples in Germany: Here it is quite normal, that part of the motorway_links have to lanes, one for each direction. These are either mapped as two separated lines (but mostly they are not separated, so imho this is actually a mapping error), or they are mapped as one single line, but normally without any oneway attribute.
Motorway_link implies oneway=yes according to wiki (http://wiki.openstreetmap.org/wiki/Motorway_link) In case it is not oneway=yes it is a mapping error not to tag it oneway=no. However, I see that this is a very easy mistake to make!
- If we do not assume oneway=yes and our assumption is wrong, the the routing might give some false turn commands (in most cases this will not happen, since the allowed way is also mostly the fastest way), but will always use the nearest junction.
As a consequence, I think we shouldn't assume one=yes as default for motorway_links.
That would work mostly well I guess. However, it is better to fix mapping errors than try to adjust style for correcting them. -- Harri