diff --git a/layers/transportation/mapping.yaml b/layers/transportation/mapping.yaml
index bc82b8a..b935b37 100644
--- a/layers/transportation/mapping.yaml
+++ b/layers/transportation/mapping.yaml
@@ -11,30 +11,6 @@ generalized_tables:
     sql_filter: railway='rail' AND service=''
     tolerance: 20.0
 
-# etldoc: imposm3 -> osm_highway_linestring_gen6
-  highway_linestring_gen6:
-    source: highway_linestring_gen5
-    sql_filter: highway IN ('motorway') AND NOT is_area
-    tolerance: 2000.0
-
-# etldoc: imposm3 -> osm_highway_linestring_gen5
-  highway_linestring_gen5:
-    source: highway_linestring_gen4
-    sql_filter: highway IN ('motorway','trunk') AND NOT is_area
-    tolerance: 500.0
-
-# etldoc: imposm3 -> osm_highway_linestring_gen4
-  highway_linestring_gen4:
-    source: highway_linestring_gen3
-    sql_filter: highway IN ('motorway','trunk') AND NOT is_area
-    tolerance: 200.0
-
-# etldoc: imposm3 -> osm_highway_linestring_gen3
-  highway_linestring_gen3:
-    source: highway_linestring_gen2
-    sql_filter: highway IN ('motorway','trunk', 'primary') AND NOT is_area
-    tolerance: 120.0
-
 # etldoc: imposm3 -> osm_highway_linestring_gen2
   highway_linestring_gen2:
     source: highway_linestring_gen1