[Tagging] Feature Proposal - RFC - value 'basic_network' - cycle_network?

[Minh Nguyen]

Vào lúc 23:51 2021-11-27, Sebastian Gürtler đã viết:
> 
> * Quite special situation but really a thing where I have no other 
> solution: We have situations where the "basic network" crosses other 
> routes that are signposted as well but there are strictly separated so 
> that if you come from one route you won't see the signs of the other. 
> You only give a representation of that if you create route relations. If 
> you only tag the ways then you can't discriminate the possibility that 
> there are signposted branches on the crossing (which make up a node). 
> (Examples 
> <https://wiki.openstreetmap.org/wiki/User:Segubi/Elemente_NRW-Radwegenetz#Crossing_of_different_networks>)

In this example, if the two operators are both "local", then clearly the 
ncn/rcn/lcn hierarchy is too limited. For route relations and network 
relations, cycle_network=* can make finer-grained distinctions, but that 
key is rarely used on ways. A similar lack of specificity in hgv=* led 
to the widespread tagging of hgv:national_network=* for truck routes in 
the U.S., although it didn't lead to relations, since truck routes 
happen to be less abstract than actual routes.

Are there any "blind crossings" of two routes from the same network, 
e.g. NRW and NRW? That would be a stronger argument in favor of route 
relations, as opposed to more detailed keys on ways or some other kind 
of relation.

> * I join the strong opinion that the routes in mention are also routes 
> in osm-sense, they differ from streets as you have no characteristics of 
> the ways as in streets, the bicycle routes use all kinds of ways "as a 
> guest" the ways are not continuously cycleways. For cars: A motorway is 
> a motorway, a national street is a national street, they may not use 
> temporarily a foot path for a few 100 meters and continue again as a 
> motorway. As Peter Elderson stated - this would be close to tagging for 
> the renderer.
> 
> ("If you want to query for the "basic network", now you just query for 
> highway=cycleway + network=lcn." doesn't work! And you would have to tag 
> the nation wide network with lcn, where there have been lots of 
> discussions on it without an agreement for over a decade.)

I think the suggestion was that the ways be tagged lcn=yes. 20% of 
lcn=yes ways are tagged highway=residential, so it's no problem that 
these routes follow non-dedicated infrastructure.

-- 
minh at nguyen.cincinnati.oh.us