@SK53 I miss "maxspeed:forward" and "maxspeed:backward" in your query. At least in my country there are a lot of different maxspeeds for each direction.
@mcliquid You can vary the query or add those to it (e.g., https://overpass-turbo.eu/s/1tKd), but even in less than 2% of highway=primary was has those tags compared with 85% with maxspeed . And maxspeed is very well mapped for both in Tirol & Vorarlberg.
https://taginfo.geofabrik.de/europe/austria/tags/highway=primary#combinations
@SK53 Thank you for the customized overpass request. I have invested some work in the last weeks and have extended the query again significantly for this. https://overpass-turbo.eu/s/1u7B
The area is not very large, but still a whole state is now complete in this consideration