diff --git a/layers/transportation/etl_diagram.png b/layers/transportation/etl_diagram.png
index fb043069..f960a379 100644
Binary files a/layers/transportation/etl_diagram.png and b/layers/transportation/etl_diagram.png differ
diff --git a/layers/transportation/mapping.yaml b/layers/transportation/mapping.yaml
index 1f01322b..29cd399b 100644
--- a/layers/transportation/mapping.yaml
+++ b/layers/transportation/mapping.yaml
@@ -31,6 +31,48 @@ generalized_tables:
     sql_filter: ST_IsValid(geometry)
     tolerance: ZRES13
 
+# etldoc: osm_shipway_linestring_gen_z5 -> osm_shipway_linestring_gen_z4
+  shipway_linestring_gen_z4:
+    source: shipway_linestring_gen_z5
+    sql_filter: ST_Length(geometry)>2*ZRES0
+    tolerance: ZRES5
+
+# etldoc: osm_shipway_linestring_gen_z6 -> osm_shipway_linestring_gen_z5
+  shipway_linestring_gen_z5:
+    source: shipway_linestring_gen_z6
+    sql_filter: ST_Length(geometry)>ZRES0
+    tolerance: ZRES6
+
+# etldoc: osm_shipway_linestring_gen_z7 -> osm_shipway_linestring_gen_z6
+  shipway_linestring_gen_z6:
+    source: shipway_linestring_gen_z7
+    sql_filter: ST_Length(geometry)>ZRES1
+    tolerance: ZRES7
+
+# etldoc: osm_shipway_linestring_gen_z8 -> osm_shipway_linestring_gen_z7
+  shipway_linestring_gen_z7:
+    source: shipway_linestring_gen_z8
+    sql_filter: ST_Length(geometry)>ZRES2
+    tolerance: ZRES8
+
+# etldoc: osm_shipway_linestring_gen_z9 -> osm_shipway_linestring_gen_z8
+  shipway_linestring_gen_z8:
+    source: shipway_linestring_gen_z9
+    sql_filter: ST_Length(geometry)>ZRES3
+    tolerance: ZRES9
+
+# etldoc: osm_shipway_linestring_gen_z10 -> osm_shipway_linestring_gen_z9
+  shipway_linestring_gen_z9:
+    source: shipway_linestring_gen_z10
+    sql_filter: ST_Length(geometry)>ZRES4
+    tolerance: ZRES10
+
+# etldoc: osm_shipway_linestring_gen_z11 -> osm_shipway_linestring_gen_z10
+  shipway_linestring_gen_z10:
+    source: shipway_linestring_gen_z11
+    sql_filter: ST_Length(geometry)>ZRES5
+    tolerance: ZRES11
+
 # etldoc: osm_shipway_linestring_gen_z12 -> osm_shipway_linestring_gen_z11
   shipway_linestring_gen_z11:
     source: shipway_linestring_gen_z12
diff --git a/layers/transportation/style.json b/layers/transportation/style.json
index 1204bc36..d0f23575 100644
--- a/layers/transportation/style.json
+++ b/layers/transportation/style.json
@@ -5,13 +5,13 @@
       "type": "line",
       "source": "openmaptiles",
       "source-layer": "transportation",
-      "minzoom": 10,
+      "minzoom": 4,
       "layout": {
         "line-join": "round",
         "visibility": "visible"
       },
       "paint": {
-        "line-color": "#7d7df8",
+        "line-color": "#66f",
         "line-width": {
           "stops": [
             [
@@ -25,8 +25,8 @@
           ]
         },
         "line-dasharray": [
-          2,
-          2
+          6,
+          6
         ]
       },
       "filter": [
diff --git a/layers/transportation/transportation.sql b/layers/transportation/transportation.sql
index 7a516f65..3ef97918 100644
--- a/layers/transportation/transportation.sql
+++ b/layers/transportation/transportation.sql
@@ -674,6 +674,237 @@ FROM (
          WHERE zoom_level >= 13
          UNION ALL
 
+         -- etldoc: osm_shipway_linestring_gen_z4  ->  layer_transportation:z4
+         SELECT osm_id,
+                geometry,
+                NULL AS highway,
+                NULL AS construction,
+                NULL AS network,
+                NULL AS railway,
+                NULL AS aerialway,
+                shipway,
+                NULL AS public_transport,
+                service_value(service) AS service,
+                NULL::text AS access,
+                NULL::boolean AS toll,
+                is_bridge,
+                is_tunnel,
+                is_ford,
+                NULL::boolean AS expressway,
+                is_ramp,
+                is_oneway,
+                NULL AS man_made,
+                layer,
+                NULL::int AS level,
+                NULL::boolean AS indoor,
+                NULL AS bicycle,
+                NULL AS foot,
+                NULL AS horse,
+                NULL AS mtb_scale,
+                NULL AS surface,
+                z_order
+         FROM osm_shipway_linestring_gen_z4
+         WHERE zoom_level = 4
+         UNION ALL
+
+         -- etldoc: osm_shipway_linestring_gen_z5  ->  layer_transportation:z5
+         SELECT osm_id,
+                geometry,
+                NULL AS highway,
+                NULL AS construction,
+                NULL AS network,
+                NULL AS railway,
+                NULL AS aerialway,
+                shipway,
+                NULL AS public_transport,
+                service_value(service) AS service,
+                NULL::text AS access,
+                NULL::boolean AS toll,
+                is_bridge,
+                is_tunnel,
+                is_ford,
+                NULL::boolean AS expressway,
+                is_ramp,
+                is_oneway,
+                NULL AS man_made,
+                layer,
+                NULL::int AS level,
+                NULL::boolean AS indoor,
+                NULL AS bicycle,
+                NULL AS foot,
+                NULL AS horse,
+                NULL AS mtb_scale,
+                NULL AS surface,
+                z_order
+         FROM osm_shipway_linestring_gen_z5
+         WHERE zoom_level = 5
+         UNION ALL
+
+         -- etldoc: osm_shipway_linestring_gen_z6  ->  layer_transportation:z6
+         SELECT osm_id,
+                geometry,
+                NULL AS highway,
+                NULL AS construction,
+                NULL AS network,
+                NULL AS railway,
+                NULL AS aerialway,
+                shipway,
+                NULL AS public_transport,
+                service_value(service) AS service,
+                NULL::text AS access,
+                NULL::boolean AS toll,
+                is_bridge,
+                is_tunnel,
+                is_ford,
+                NULL::boolean AS expressway,
+                is_ramp,
+                is_oneway,
+                NULL AS man_made,
+                layer,
+                NULL::int AS level,
+                NULL::boolean AS indoor,
+                NULL AS bicycle,
+                NULL AS foot,
+                NULL AS horse,
+                NULL AS mtb_scale,
+                NULL AS surface,
+                z_order
+         FROM osm_shipway_linestring_gen_z6
+         WHERE zoom_level = 6
+         UNION ALL
+
+         -- etldoc: osm_shipway_linestring_gen_z7  ->  layer_transportation:z7
+         SELECT osm_id,
+                geometry,
+                NULL AS highway,
+                NULL AS construction,
+                NULL AS network,
+                NULL AS railway,
+                NULL AS aerialway,
+                shipway,
+                NULL AS public_transport,
+                service_value(service) AS service,
+                NULL::text AS access,
+                NULL::boolean AS toll,
+                is_bridge,
+                is_tunnel,
+                is_ford,
+                NULL::boolean AS expressway,
+                is_ramp,
+                is_oneway,
+                NULL AS man_made,
+                layer,
+                NULL::int AS level,
+                NULL::boolean AS indoor,
+                NULL AS bicycle,
+                NULL AS foot,
+                NULL AS horse,
+                NULL AS mtb_scale,
+                NULL AS surface,
+                z_order
+         FROM osm_shipway_linestring_gen_z7
+         WHERE zoom_level = 7
+         UNION ALL
+
+         -- etldoc: osm_shipway_linestring_gen_z8  ->  layer_transportation:z8
+         SELECT osm_id,
+                geometry,
+                NULL AS highway,
+                NULL AS construction,
+                NULL AS network,
+                NULL AS railway,
+                NULL AS aerialway,
+                shipway,
+                NULL AS public_transport,
+                service_value(service) AS service,
+                NULL::text AS access,
+                NULL::boolean AS toll,
+                is_bridge,
+                is_tunnel,
+                is_ford,
+                NULL::boolean AS expressway,
+                is_ramp,
+                is_oneway,
+                NULL AS man_made,
+                layer,
+                NULL::int AS level,
+                NULL::boolean AS indoor,
+                NULL AS bicycle,
+                NULL AS foot,
+                NULL AS horse,
+                NULL AS mtb_scale,
+                NULL AS surface,
+                z_order
+         FROM osm_shipway_linestring_gen_z8
+         WHERE zoom_level = 8
+         UNION ALL
+
+         -- etldoc: osm_shipway_linestring_gen_z9  ->  layer_transportation:z9
+         SELECT osm_id,
+                geometry,
+                NULL AS highway,
+                NULL AS construction,
+                NULL AS network,
+                NULL AS railway,
+                NULL AS aerialway,
+                shipway,
+                NULL AS public_transport,
+                service_value(service) AS service,
+                NULL::text AS access,
+                NULL::boolean AS toll,
+                is_bridge,
+                is_tunnel,
+                is_ford,
+                NULL::boolean AS expressway,
+                is_ramp,
+                is_oneway,
+                NULL AS man_made,
+                layer,
+                NULL::int AS level,
+                NULL::boolean AS indoor,
+                NULL AS bicycle,
+                NULL AS foot,
+                NULL AS horse,
+                NULL AS mtb_scale,
+                NULL AS surface,
+                z_order
+         FROM osm_shipway_linestring_gen_z9
+         WHERE zoom_level = 9
+         UNION ALL
+
+         -- etldoc: osm_shipway_linestring_gen_z10  ->  layer_transportation:z10
+         SELECT osm_id,
+                geometry,
+                NULL AS highway,
+                NULL AS construction,
+                NULL AS network,
+                NULL AS railway,
+                NULL AS aerialway,
+                shipway,
+                NULL AS public_transport,
+                service_value(service) AS service,
+                NULL::text AS access,
+                NULL::boolean AS toll,
+                is_bridge,
+                is_tunnel,
+                is_ford,
+                NULL::boolean AS expressway,
+                is_ramp,
+                is_oneway,
+                NULL AS man_made,
+                layer,
+                NULL::int AS level,
+                NULL::boolean AS indoor,
+                NULL AS bicycle,
+                NULL AS foot,
+                NULL AS horse,
+                NULL AS mtb_scale,
+                NULL AS surface,
+                z_order
+         FROM osm_shipway_linestring_gen_z10
+         WHERE zoom_level = 10
+         UNION ALL
+
          -- etldoc: osm_shipway_linestring_gen_z11  ->  layer_transportation:z11
          SELECT osm_id,
                 geometry,
diff --git a/layers/transportation_name/etl_diagram.png b/layers/transportation_name/etl_diagram.png
index d46ad20c..c4ee4e00 100644
Binary files a/layers/transportation_name/etl_diagram.png and b/layers/transportation_name/etl_diagram.png differ