default int getWayZorder() {
    return Parse.wayzorder(tags());
  }
Returns a z-order for an OSM road based on the tags that are present. Bridges are above roads appear above tunnels
and major roads appear above minor.

@see Imposm3Parsers#wayzorder(Map)
planetiler-core/src/main/java/com/onthegomap/planetiler/reader/WithTags.java