Show OSM highways earlier

layers/transportation/highway.sql

@@ -19,13 +19,13 @@ RETURNS TABLE(osm_id bigint, geometry geometry, class highway_class, subclass te
 			FALSE AS is_bridge, FALSE AS is_tunnel, FALSE AS is_ford, FALSE AS is_ramp, FALSE AS is_oneway,
 			0 AS z_order
 		FROM ne_10m_global_roads
-		WHERE zoom_level BETWEEN 4 AND 7 AND scalerank <= 1 + zoom_level
+		WHERE zoom_level BETWEEN 4 AND 6 AND scalerank <= 1 + zoom_level
 		UNION ALL
 
 		-- etldoc: osm_transportation_linestring_gen4  ->  layer_transportation:z8
 		SELECT osm_id, geometry, highway, is_bridge, is_tunnel, is_ford, is_ramp, is_oneway, z_order
         FROM osm_transportation_linestring_gen4
-		WHERE zoom_level = 8
+		WHERE zoom_level BETWEEN 7 AND 8
 		UNION ALL
 
 		-- etldoc: osm_transportation_linestring_gen3  ->  layer_transportation:z9