[Talk-us] Ferries

[Martijn van Exel]

It's the other way around, really. We're adjusting our routing logic
to adapt to OSM. Referring to the wiki, a service road is 'Generally
for access to a building, motorway service station, beach, campsite,
industrial estate, business park, etc.' - so by that definition, a
service road would typically only occur at the beginning or the end of
the route, and that's what we tell our routing engine to do. If it
were to turn out that this definition of what a service road is, is in
fact not how it is generally used in mapping, then we'd need to
revisit the wiki (and our routing rules) - but from what I have seen
in my pretty extensive mapping experience in the U.S., the definition
generally holds. So it makes sense to me to suggest a different
tagging for these ferry access routes, not only (and not even
primarily) to satisfy our or any third party logic using the data, but
to bring more consistency to OSM in general.

On Wed, Nov 6, 2013 at 5:47 PM, Greg Troxel <gdt at ir.bbn.com> wrote:
>
> Martijn van Exel <martijnv at telenav.com> writes:
>
>> It turns out that this happens because some of the access roads to
>> these ferries are tagged as highway=service, sometimes
>> service=driveway. For various reasons we don't want to route folks
>> through service roads, so this poses a challenge. Here's an example:
>> http://www.openstreetmap.org/#map=19/48.42169/-123.37231
>
> It seems wrong to adjust tagging because of a particular router.
>
> I would say that you should fix your routing.  If they are service
> roads, but you don't want to use them, then you get the route your
> policy led to.
>
> I'm guessing you are trying to prevent routes that shortcut through
> service roads when such usage would be frowned on.  But at the same
> time, if you need to get someplace accessible only via a service road,
> that's what you have to do.
>
> Perhaps your router should just have a higher cost for service roads
> (somewhat fair, given lower speeds?), or a prohibition on
> regular->service->regular, such that regular->service->ferry is ok.
>
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-- 
--
Martijn van Exel
OSM data specialist
Telenav
http://www.osm.org/user/mvexel
http://wiki.openstreetmap.org/wiki/User:Mvexel
http://hdyc.neis-one.org/?mvexel