Keep the filter for z4 same as z5.

layers/transportation/update_transportation_merge.sql

@@ -807,8 +807,7 @@ BEGIN
             WHERE transportation.changes_z4_z5_z6_z7.is_old IS FALSE AND
                   transportation.changes_z4_z5_z6_z7.id = osm_transportation_merge_linestring_gen_z5.id
         )) AND
-        osm_national_network(network) AND
-        -- Current view: national-importance motorways and trunks
+        -- Current view: same as z5
         ST_Length(geometry) > 1000
     ON CONFLICT (id) DO UPDATE SET osm_id = excluded.osm_id, highway = excluded.highway, network = excluded.network,
                                    construction = excluded.construction, is_bridge = excluded.is_bridge,