[BUG] Highways and expressways (in Poland) have wrong `ref` about planetiler

[msbarry]

Thanks @caspg, it looks like this is one of the ways you are talking about that exists in both relations: https://www.openstreetmap.org/way/536642248

I'm a little confused how openmaptiles is choosing S7 for the transportation name ref value since this logic appears to just take the ref value from route_1 if it's a valid route network?

https://github.com/openmaptiles/openmaptiles/blob/8693822d506076d1cbf0d777d40d3a0a12986ce6/layers/transportation_name/update_transportation_name.sql#L299-L303

[ZeLonewolf]

Huh, I'm surprised it works that way and I wrote the route_N functionality in OpenMapTiles. If anything, I would say the planetiler output is the intended implementation and openmaptiles has a bug 🤔

[msbarry]

I think route_n is right but omt has logic to use refs preferring:

1. Major networks the way is a part of
2. Ref tag on the way

Planetiler was using the ref from any network the way was a part of instead of the ref on the way. I changed it to match omt's behavior, and added an optional flag to fall back to the ref from any relation if 1 and 2 are missing.

Sounds like there may need to be some more complex handling in openmaptiles for this network type?