Topography: Highway Trunk Missing

[lordfolken]

https://www.openstreetmap.org/way/95093006

So according to the tags in OSM this is a highway = trunk

Unfortunatly this get's currently filtered at the reduction stage of the topography:
https://github.com/XCSoar/xcsoar-mapgen-topology/blob/860ea26e5190aa369282cc7480bd461e7a4d18eb/scripts/reduce_roads_big.py#L28C1-L28C90

I updated the script to include trunks and trunk_links.
https://github.com/XCSoar/xcsoar-mapgen-topology/blob/master/scripts/reduce_roads_big.py

[Joerg-CH]

Apparently, the updated script is either not active yet, or it does not work as it should do.
I found, that the road B30 from Ulm to Friedrichshafen is not shown in the map until Hochdorf, south of Biberach, see screenshot

In Open Street Map, the part from Ulm southbound is tagged as highway = trunk (=> invisible), and at Hochdorf, it switches to highway = primary (=> visible).

The map used is recently created with XCSoar Map Generator
map name: Karte DE 7_14_46_52c
generator: XCSoar Map Generator
creation time: 18.04.2025 23:52:00 (1745013120)
latitude range: 46.0 to 52.0
longitude range: 7.0 to 14.0
author: schuongf@hotmail.com
(Map created without wpt database, with high resolution terrain, no compression, level of detail 3 and bounds by hand).

Interestingly, on an older map (GER_HighRes.xcm from 01.07.2022), the road is visible in full length. On OSM, the tag highway = trunk is there since over 15 years (version #1 of the B30 history).

On the B29 west of Aalen, there is also an invisible part on the newer map. But this seems to be even more strange:
In OSM, every part is tagged as highway = trunk, but only the eastern part is visible in the newer map. In the older map, all is visible, but the crossing between B19 and B29 is also the old one.
On the new map, the western part is invisible:

On OSM, this part is:

the eastern part is:

and the crossing is:

On the older map it looks:

So, there must be some other reason, why some parts of the big roads are not shown in the new maps.