[OSM-talk-be] trunk crossroads and cyclerouting
benlaenen at gmail.com
Mon Dec 6 11:41:25 GMT 2010
Klaas Gadeyne wrote:
> This way is currently tagged as trunk_link
> <http://wiki.openstreetmap.org/wiki/Link_(highway)>. However, (at
> least in Belgium) trunk roads are prohibited for bicycles.
Well, yes and no. Yes for 99% of trunks in Belgium, but there are exceptions,
particularly at crossroads where one wouldn't downgrade small pieces of road.
Take for example a crossing between two dual carriage roads, one trunk, the
other primary: you wouldn't split the trunk at the crossing to downgrade it on
that little bit to primary.
I wouldn't use links for these bits either: links are primarily for ramps (op-
en afritten) to the road, like those on motorways.
> So it seems like trunk_link ways are also "bicycles prohibited". Does
> anyone have a suggestion/thought on how to fix this?
> - Changing trunk_link into primary_link seems weird (and only solves
> the problem locally)
I usually tag these small ways between two lanes of a dual carriage road with
the same classification of the crossing roads, in this case
highway=unclassified. But there's no strict rule on this AFAIK, even though we
could really use one...
(Also, preferably keep this little way as a separate way, i.e. don't join with
the crossing roads)
> - Altering the "bicycles prohibited behaviour" of trunk_link sections
> seems to be an option, but I don't know if this is the best thing to
> do and whom to contact for that?
It's just something we as osm-be agree on (or not), routers etc should follow
what we agree on (but nowadays often don't of course since they only have one
set of rules for the entire world).
In the best case you'd have other tags on the road telling if it blocks access
or not, like
* motorroad=yes for "autoweg" (original meaning for trunk in Belgium, but
we've added other roads that block access to pedestrians and cyclists to
trunk, and on the other hand have "autowegen" that aren't classified as trunk)
* foot=no, bicycle=no, moped=no if there are traffic signs for these
If all trunks had these tags it'd be safe to allow pedestrians and cyclists on
trunks *by default*, but that's not the case by far, so we need some other
single magic tag that says this. I can only think of motorroad=no for this.
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