[Tagging] Clarification on the role link in route relations

[Dave F]

I'm still struggling to see what this has to do with route relations.

Maybe you're confused between 'routing software' & 'route relations'.
They are independent of each other. Routing software can, of course, use 
route relations, but they are not reliant on each other.

The tags you describe are all on ways, not route relations. It seems 
they're best described as 'niceties', but not essential to routing 
software. A router can still find its destination without them, the 
instructions would just be 'take the next exit' instead of take the exit 
to Memphis'.


I'm intrigued by your Point 3.
Please provide a link to it in OSM & details of your rendering (Github, 
website?).

DaveF



On 12/01/2022 11:16, Minh Nguyen wrote:
>
> Route relations carry essential, structured information about the 
> route that cannot be reliably derived from parsing ref=* on the way. 
> The U.S. has an incredibly complex system of route networks with often 
> conflicting alphabetic prefixes and route shields with distinctive 
> shapes and colors, which we distinguish using the network=* key. Route 
> relations are important enough to Americans that members of the U.S. 
> community are developing a new renderer that uses route relations to 
> showcase correct-looking route shields, similar to OsmAnd's behavior 
> but more thorough. During testing, we found visual anomalies that were 
> caused by "link" members, hence my original question. [3]
>
>
> [3] https://github.com/ZeLonewolf/openstreetmap-americana/issues/79