[Tagging] [OSM-talk] OSM is a right mess

Shawn K. Quinn skquinn at rushpost.com
Wed Jun 3 08:39:46 UTC 2015

On Wed, 2015-06-03 at 08:00 +0200, Maarten Deen wrote:
> On 2015-06-03 02:04, pmailkeey . wrote:
> > iD shows oneway=unknown if it's not set. If it's unknown, iD should
> > not show oneway at all.
> I agree.
> > In OSM if oneway=no then it's not oneway and the oneway tag should not
> > appear at all.
> Here I don't agree.
> > The only time oneway should appear is in the case of oneway=yes - and
> > the '=yes' is superfluous.
> Some roads are implied oneway. E.g. junction=roundabout and 
> highway=motorway both imply that the road is one-way only. If for some 
> reason the object in case is not oneway, a oneway=no tag is very much 
> needed.

I think highway=motorway_link is also implied one-way. Are there any

> There is also the occurence of oneway=-1 in case someone reverses the 
> direction of a way. What should be done when the only possibility for 
> oneway is either set or unset and the direction gets reversed? Should 
> reversing be disallowed? Should you get a warning "oneway street can not 
> be reversed"?

oneway=-1 now triggers a validation warning in JOSM. I have yet to see a
case where oneway=-1 is truly needed. Do any exist?

Shawn K. Quinn <skquinn at rushpost.com>

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