[Talk-ca] GPS and Motorway links ...

[Daniel Begin]

Hooo, I see, and I also see there was not a large consensus on that point
(Discussion) since all other ways are having a different behavior.

 

About all motorway_link in Canada are having the same problem! 

 

At least everything imported via Canvec and possibly the same with GeoBase.
Actually, we might have to add oneway=no for all motorway_link that that do
not have the tag. However, it may exist some motorway_link that have been
captured using this rule.

 

Any idea about the best way to proceed to correct the problem?

 

Daniel

 

 

From: Harald Kliems [mailto:kliems at gmail.com] 
Sent: November-25-13 15:06
To: Daniel Begin
Cc: Talk-CA OpenStreetMap
Subject: Re: [Talk-ca] GPS and Motorway links ...

 

Daniel,

if you look at the motorway_link page in the wiki
(http://wiki.openstreetmap.org/wiki/Motorway_link) you'll see that by
default it implies oneway=yes. That would explain the behavior you
described. 

 

"Most motorway_link roads will be one way, and should be tagged
<http://wiki.openstreetmap.org/wiki/Key:oneway> oneway=
<http://wiki.openstreetmap.org/wiki/Tag:oneway%3Dyes> yes. Any unusual
motorway link road which is two-way should be explicitly tagged
<http://wiki.openstreetmap.org/wiki/Key:oneway> oneway=
<http://wiki.openstreetmap.org/wiki/Tag:oneway%3Dno> no. Note that this is
different to the way we treat other highway classifications, because
motorway link roads are so often one way. Explicit tagging (either way) can
be important, since some tools interpret motorway link roads as implicitly
oneway=yes unless tagged oneway=no."

 

I wonder if there would be a way to filter all those links that are reversed
with the Overpass API?

 

 Harald.

 

On Mon, Nov 25, 2013 at 2:40 PM, Daniel Begin <jfd553 at hotmail.com> wrote:

Bonjour, 

 

I've just found out that I have routing troubles with OSM data in a Garmin
GPS when motorway_link are not tagged oneway=yes/no. Here is an example
where some segments of motorway_link can be driven both ways (2 lanes, one
each side)

 

http://www.openstreetmap.org/#map=16/46.0194/-72.3512

 

Everything works fine when tags are.

highway=motorway_link

oneway=no, or 

oneway=yes

 

But it doesn't work if there is no oneway tag. Actually, the way must have
been digitized in the direction I want ot go - as if it assumes that no
oneway tag means oneway=yes.  In the provided example, my GPS will find a
way out of the motorway but it will not find a way in! -  must be looked at
in an editor.

 

It could have been my usual OSM/Garmin provider (
http://www.osmmaps.com/maps/canada ) but when I saw the same behavior in
JOSM I wonder if there is a rule I'm not aware of? Should I change my
OSM/Garmin provider or tell him there is a problem with his conversion
program?

 

Comments or answers?

 

Daniel


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