On Fri, Sep 11, 2015 at 6:56 AM, Shawn K. Quinn <[email protected]> wrote:
> On Thu, 2015-09-10 at 14:20 +0200, Joachim wrote: > > I drafted up a proposal about oneway=* for highway=motorway_link. > > Please comment. > > > http://wiki.openstreetmap.org/wiki/Proposed_features/Motorway_link_obligatory_oneway > > > > Proposal: > > Define on the wiki page of highway=motorway_link that oneway=* must > > also be tagged for every motorway_link. If not tagged, the oneway=* > > status of this way is undefined. > > Though I agree in principle with the idea of making tagging more > explicit, how big of a practical concern is this? i.e. how many times in > the real world is motorway_link a two-way road? It's enough of an edge case I'm in favor of there not being a reasonable assumption. Most are one-way, there's a considerable number that aren't. Immediately coming to mind are multiple ramps joining US:OK:Turnpike to surface highways, particularly when not within a major urban center (such a configuration allows a single toll taker to provide information, receipts, change and collect tolls from a single booth where mainline toll collection is not feasible). Ideally checking motorway_link for oneway=* and warning for values other than yes or no would be be handled by validators (something I also support for motorway and motorway_link for foot=* and bicycle=* since there's a very wide mix of both in North America, making blanket assumptions generally bad on this continent). > - For routing purposes it is recommended to not route over ways with > > undefined oneway since any assumption may be wrong and it would be > > best to correct the data. > > This I don't. In a lot of cases the likely direction of a motorway_link > can be inferred by the angle of the junction, even if not explicitly > tagged. Agreed. > > - In map editors undefined oneway should be displayed as tagging > > error. > > This makes sense, but will cause a fair amount of grief while the > existing data is fixed. > This is a band aid that needs to be ripped off, and sooner is better than later. Just look at the fun we're having killing route refs on ways (as opposed to route=road relations) dinosaur...
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