Following https://github.com/openmaptiles/openmaptiles/pull/1027, solving https://github.com/openmaptiles/openmaptiles/issues/999. Adding brunnel attributes to merge tables of `transportation` layer, now it is possible to style/filter tunnels, bridges and fords in all zoom levels. Tested on Switzerland and Europe. Changes in generation speed and filesize minimal.
transportation
Docs
Read the layer documentation at http://openmaptiles.org/schema#transportation

