diff --git a/layers/transportation/network_type.sql b/layers/transportation/network_type.sql
index b54dc8d6..7e384a37 100644
--- a/layers/transportation/network_type.sql
+++ b/layers/transportation/network_type.sql
@@ -15,12 +15,23 @@ $$
         WHEN undefined_object THEN
             CREATE TYPE route_network_type AS enum (
                 'us-interstate', 'us-highway', 'us-state',
-                'ca-transcanada',
+                'ca-transcanada', 'ca-provincial-arterial', 'ca-provincial',
                 'gb-motorway', 'gb-trunk'
                 );
     END
 $$;
 
+-- Top-level national route networks that should display at the lowest zooms
+CREATE OR REPLACE FUNCTION osm_national_network(network text) RETURNS boolean AS
+$$
+    SELECT network <> '' AND network IN (
+        -- Canada
+        'ca-transcanada', 'ca-provincial-arterial',
+        -- United States
+        'us-interstate');
+$$ LANGUAGE sql IMMUTABLE
+                PARALLEL SAFE;
+
 DO
 $$
     BEGIN
diff --git a/layers/transportation/update_route_member.sql b/layers/transportation/update_route_member.sql
index 3a624029..de73c2a1 100644
--- a/layers/transportation/update_route_member.sql
+++ b/layers/transportation/update_route_member.sql
@@ -22,7 +22,7 @@ INSERT INTO osm_route_member (osm_id, member, ref, network)
 SELECT *
 FROM gbr_route_members_view;
 
-CREATE OR REPLACE FUNCTION osm_route_member_network_type(network text) RETURNS route_network_type AS
+CREATE OR REPLACE FUNCTION osm_route_member_network_type(network text, ref text) RETURNS route_network_type AS
 $$
 SELECT CASE
            WHEN network = 'US:I' THEN 'us-interstate'::route_network_type
@@ -30,6 +30,17 @@ SELECT CASE
            WHEN network LIKE 'US:__' THEN 'us-state'::route_network_type
            -- https://en.wikipedia.org/wiki/Trans-Canada_Highway
            WHEN network LIKE 'CA:transcanada%' THEN 'ca-transcanada'::route_network_type
+           WHEN network = 'CA:QC:A' THEN 'ca-provincial-arterial'::route_network_type
+           WHEN network = 'CA:ON:primary' THEN
+               CASE
+                   WHEN ref LIKE '4__' THEN 'ca-provincial-arterial'::route_network_type
+                   WHEN ref = 'QEW' THEN 'ca-provincial-arterial'::route_network_type
+                   ELSE 'ca-provincial-arterial'::route_network_type
+               END
+           WHEN network = 'CA:MB:PTH' AND ref = '75' THEN 'ca-provincial-arterial'::route_network_type
+           WHEN network = 'CA:AB:primary' AND ref IN ('2','3','4') THEN 'ca-provincial-arterial'::route_network_type
+           WHEN network = 'CA:BC' AND ref IN ('3','5','99') THEN 'ca-provincial-arterial'::route_network_type
+           WHEN network LIKE 'CA:__' OR network LIKE 'CA:__:%' THEN 'ca-provincial'::route_network_type
            WHEN network = 'omt-gb-motorway' THEN 'gb-motorway'::route_network_type
            WHEN network = 'omt-gb-trunk' THEN 'gb-trunk'::route_network_type
            END;
@@ -39,9 +50,9 @@ $$ LANGUAGE sql IMMUTABLE
 -- etldoc:  osm_route_member ->  osm_route_member
 -- see http://wiki.openstreetmap.org/wiki/Relation:route#Road_routes
 UPDATE osm_route_member
-SET network_type = osm_route_member_network_type(network)
+SET network_type = osm_route_member_network_type(network, ref)
 WHERE network != ''
-  AND network_type IS DISTINCT FROM osm_route_member_network_type(network)
+  AND network_type IS DISTINCT FROM osm_route_member_network_type(network, ref)
 ;
 
 CREATE OR REPLACE FUNCTION update_osm_route_member() RETURNS void AS
@@ -64,7 +75,7 @@ BEGIN
     SELECT
       id,
       osm_id,
-      osm_route_member_network_type(network) AS network_type,
+      osm_route_member_network_type(network, ref) AS network_type,
       DENSE_RANK() over (PARTITION BY member ORDER BY network_type, network, LENGTH(ref), ref) AS concurrency_index,
       CASE
            WHEN network IN ('iwn', 'nwn', 'rwn') THEN 1
@@ -80,7 +91,7 @@ BEGIN
 END;
 $$ LANGUAGE plpgsql;
 
-CREATE INDEX IF NOT EXISTS osm_route_member_network_idx ON osm_route_member ("network");
+CREATE INDEX IF NOT EXISTS osm_route_member_network_idx ON osm_route_member ("network", "ref");
 CREATE INDEX IF NOT EXISTS osm_route_member_member_idx ON osm_route_member ("member");
 CREATE INDEX IF NOT EXISTS osm_route_member_name_idx ON osm_route_member ("name");
 CREATE INDEX IF NOT EXISTS osm_route_member_ref_idx ON osm_route_member ("ref");
diff --git a/layers/transportation/update_transportation_merge.sql b/layers/transportation/update_transportation_merge.sql
index 9f048a46..dcf12a50 100644
--- a/layers/transportation/update_transportation_merge.sql
+++ b/layers/transportation/update_transportation_merge.sql
@@ -331,9 +331,7 @@ BEGIN
         (highway = 'motorway'
             OR construction = 'motorway'
             -- Allow trunk roads that are part of a nation's most important route network to show at z4
-            OR highway = 'trunk' AND
-                network <> '' AND
-                network IN ('ca-transcanada','us-interstate')
+            OR (highway = 'trunk' AND osm_national_network(network))
         ) AND
         ST_Length(geometry) > 500;
 
@@ -356,8 +354,8 @@ BEGIN
     FROM osm_transportation_merge_linestring_gen_z5
     WHERE
         (update_id IS NULL OR id = update_id) AND
+        osm_national_network(network) AND
         -- Current view: national-importance motorways and trunks
-        network IN ('ca-transcanada','us-interstate') AND
         ST_Length(geometry) > 1000;
 END;
 $$ LANGUAGE plpgsql;
diff --git a/layers/transportation_name/transportation_name.yaml b/layers/transportation_name/transportation_name.yaml
index 790fc421..b08f1193 100644
--- a/layers/transportation_name/transportation_name.yaml
+++ b/layers/transportation_name/transportation_name.yaml
@@ -28,6 +28,8 @@ layer:
       - us-highway
       - us-state
       - ca-transcanada
+      - ca-provincial-arterial
+      - ca-provincial
       - gb-motorway
       - gb-trunk
       - road (default)