Hi Luzandro,
Thank you for your feedback. I have reverted the highway classification to its previous state and updated the construction tags. The changes were initially made due to traffic disruptions caused by the district heating network expansion. This construction activity, affecting Main Street (Hauptstraße, from Schulallee to the intersection with Münchendorferstraße), was confirmed by the official website of the Himberg municipality:
https://www.himberg.gv.at/verkehrsbeeintraechtigung-durch-fernwaermenetzausbau-hauptstrasse/