diff --git a/lib/routes.js b/lib/routes.js
index 4f924a0..f1adc95 100644
--- a/lib/routes.js
+++ b/lib/routes.js
@@ -5,224 +5,224 @@ const DataError = require('./data-error')
 // Google's "Extended GTFS Route Types"
 // https://developers.google.com/transit/gtfs/reference/extended-route-types
 const googleExtendedRouteTypes = [
-	['100', 'Railway Service', null],
-	['101', 'High Speed Rail Service', 'TGV (FR), ICE (DE), Eurostar (GB)'],
-	['102', 'Long Distance Trains', 'InterCity/EuroCity'],
-	['103', 'Inter Regional Rail Service', 'InterRegio (DE), Cross County Rail (GB)'],
-	['104', 'Car Transport Rail Service', null],
-	['105', 'Sleeper Rail Service', 'GNER Sleeper (GB)'],
-	['106', 'Regional Rail Service', 'TER (FR), Regionalzug (DE)'],
-	['107', 'Tourist Railway Service', 'Romney, Hythe & Dymchurch (GB)'],
-	['108', 'Rail Shuttle (Within Complex)', 'Gatwick Shuttle (GB), Sky Line (DE)'],
-	['109', 'Suburban Railway', 'S-Bahn (DE), RER (FR), S-tog (Kopenhagen)'],
-	['110', 'Replacement Rail Service', null],
-	['111', 'Special Rail Service', null],
-	['112', 'Lorry Transport Rail Service', null],
-	['113', 'All Rail Services', null],
-	['114', 'Cross-Country Rail Service', null],
-	['115', 'Vehicle Transport Rail Service', null],
-	['116', 'Rack and Pinion Railway', 'Rochers de Naye (CH), Dolderbahn (CH)'],
-	['117', 'Additional Rail Service', null],
-	['200', 'Coach Service', null],
-	['201', 'International Coach Service', 'EuroLine, Touring'],
-	['202', 'National Coach Service', 'National Express (GB)'],
-	['203', 'Shuttle Coach Service', 'Roissy Bus (FR), Reading-Heathrow (GB)'],
-	['204', 'Regional Coach Service', null],
-	['205', 'Special Coach Service', null],
-	['206', 'Sightseeing Coach Service', null],
-	['207', 'Tourist Coach Service', null],
-	['208', 'Commuter Coach Service', null],
-	['209', 'All Coach Services', null],
-	['400', 'Urban Railway Service', null],
-	['401', 'Metro Service', 'Métro de Paris'],
-	['402', 'Underground Service', 'London Underground, U-Bahn'],
-	['403', 'Urban Railway Service', null],
-	['404', 'All Urban Railway Services', null],
-	['405', 'Monorail', null],
-	['700', 'Bus Service', null],
-	['701', 'Regional Bus Service', 'Eastbourne-Maidstone (GB)'],
-	['702', 'Express Bus Service', 'X19 Wokingham-Heathrow (GB)'],
-	['703', 'Stopping Bus Service', '38 London: Clapton Pond-Victoria (GB)'],
-	['704', 'Local Bus Service', null],
-	['705', 'Night Bus Service', 'N prefixed buses in London (GB)'],
-	['706', 'Post Bus Service', 'Maidstone P4 (GB)'],
-	['707', 'Special Needs Bus', null],
-	['708', 'Mobility Bus Service', null],
-	['709', 'Mobility Bus for Registered Disabled', null],
-	['710', 'Sightseeing Bus', null],
-	['711', 'Shuttle Bus', '747 Heathrow-Gatwick Airport Service (GB)'],
-	['712', 'School Bus', null],
-	['713', 'School and Public Service Bus', null],
-	['714', 'Rail Replacement Bus Service', null],
-	['715', 'Demand and Response Bus Service', null],
-	['716', 'All Bus Services', null],
-	['800', 'Trolleybus Service', null],
-	['900', 'Tram Service', null],
-	['901', 'City Tram Service', null],
-	['902', 'Local Tram Service', 'Munich (DE), Brussels (BE), Croydon (GB)'],
-	['903', 'Regional Tram Service', null],
-	['904', 'Sightseeing Tram Service', 'Blackpool Seafront (GB)'],
-	['905', 'Shuttle Tram Service', null],
-	['906', 'All Tram Services', null],
-	['1000', 'Water Transport Service', null],
-	['1100', 'Air Service', null],
-	['1200', 'Ferry Service', null],
-	['1300', 'Aerial Lift Service', 'Telefèric de Montjuïc (ES), Saleve (CH), Roosevel, foot Island Tramway (US)', null],
-	['1400', 'Funicular Service', 'Rigiblick (Zürich, CH)'],
-	['1500', 'Taxi Service', null],
-	['1501', 'Communal Taxi Service', 'Marshrutka (RU), dolmuş (TR)'],
-	['1502', 'Water Taxi Service', null],
-	['1503', 'Rail Taxi Service', null],
-	['1504', 'Bike Taxi Service', null],
-	['1505', 'Licensed Taxi Service', null],
-	['1506', 'Private Hire Service Vehicle', null],
-	['1507', 'All Taxi Services', null],
-	['1700', 'Miscellaneous Service', null],
-	['1702', 'Horse-drawn Carriage', null],
+	[ '100',  '2', 'Railway Service', null],
+	[ '101',  '2', 'High Speed Rail Service', 'TGV (FR), ICE (DE), Eurostar (GB)'],
+	[ '102',  '2', 'Long Distance Trains', 'InterCity/EuroCity'],
+	[ '103',  '2', 'Inter Regional Rail Service', 'InterRegio (DE), Cross County Rail (GB)'],
+	[ '104',  '2', 'Car Transport Rail Service', null],
+	[ '105',  '2', 'Sleeper Rail Service', 'GNER Sleeper (GB)'],
+	[ '106',  '2', 'Regional Rail Service', 'TER (FR), Regionalzug (DE)'],
+	[ '107',  '2', 'Tourist Railway Service', 'Romney, Hythe & Dymchurch (GB)'],
+	[ '108',  '2', 'Rail Shuttle (Within Complex)', 'Gatwick Shuttle (GB), Sky Line (DE)'],
+	[ '109',  '2', 'Suburban Railway', 'S-Bahn (DE), RER (FR), S-tog (Kopenhagen)'],
+	[ '110',  '2', 'Replacement Rail Service', null],
+	[ '111',  '2', 'Special Rail Service', null],
+	[ '112',  '2', 'Lorry Transport Rail Service', null],
+	[ '113',  '2', 'All Rail Services', null],
+	[ '114',  '2', 'Cross-Country Rail Service', null],
+	[ '115',  '2', 'Vehicle Transport Rail Service', null],
+	[ '116',  '2', 'Rack and Pinion Railway', 'Rochers de Naye (CH), Dolderbahn (CH)'],
+	[ '117',  '2', 'Additional Rail Service', null],
+	[ '200',  '3', 'Coach Service', null],
+	[ '201',  '3', 'International Coach Service', 'EuroLine, Touring'],
+	[ '202',  '3', 'National Coach Service', 'National Express (GB)'],
+	[ '203',  '3', 'Shuttle Coach Service', 'Roissy Bus (FR), Reading-Heathrow (GB)'],
+	[ '204',  '3', 'Regional Coach Service', null],
+	[ '205',  '3', 'Special Coach Service', null],
+	[ '206',  '3', 'Sightseeing Coach Service', null],
+	[ '207',  '3', 'Tourist Coach Service', null],
+	[ '208',  '3', 'Commuter Coach Service', null],
+	[ '209',  '3', 'All Coach Services', null],
+	[ '400',  '0', 'Urban Railway Service', null],
+	[ '401',  '0', 'Metro Service', 'Métro de Paris'],
+	[ '402',  '0', 'Underground Service', 'London Underground, U-Bahn'],
+	[ '403',  '0', 'Urban Railway Service', null],
+	[ '404',  '0', 'All Urban Railway Services', null],
+	[ '405', '12', 'Monorail', null],
+	[ '700',  '3', 'Bus Service', null],
+	[ '701',  '3', 'Regional Bus Service', 'Eastbourne-Maidstone (GB)'],
+	[ '702',  '3', 'Express Bus Service', 'X19 Wokingham-Heathrow (GB)'],
+	[ '703',  '3', 'Stopping Bus Service', '38 London: Clapton Pond-Victoria (GB)'],
+	[ '704',  '3', 'Local Bus Service', null],
+	[ '705',  '3', 'Night Bus Service', 'N prefixed buses in London (GB)'],
+	[ '706',  '3', 'Post Bus Service', 'Maidstone P4 (GB)'],
+	[ '707',  '3', 'Special Needs Bus', null],
+	[ '708',  '3', 'Mobility Bus Service', null],
+	[ '709',  '3', 'Mobility Bus for Registered Disabled', null],
+	[ '710',  '3', 'Sightseeing Bus', null],
+	[ '711',  '3', 'Shuttle Bus', '747 Heathrow-Gatwick Airport Service (GB)'],
+	[ '712',  '3', 'School Bus', null],
+	[ '713',  '3', 'School and Public Service Bus', null],
+	[ '714',  '3', 'Rail Replacement Bus Service', null],
+	[ '715',  '3', 'Demand and Response Bus Service', null],
+	[ '716',  '3', 'All Bus Services', null],
+	[ '800', '11', 'Trolleybus Service', null],
+	[ '900',  '0', 'Tram Service', null],
+	[ '901',  '0', 'City Tram Service', null],
+	[ '902',  '0', 'Local Tram Service', 'Munich (DE), Brussels (BE), Croydon (GB)'],
+	[ '903',  '0', 'Regional Tram Service', null],
+	[ '904',  '0', 'Sightseeing Tram Service', 'Blackpool Seafront (GB)'],
+	[ '905',  '0', 'Shuttle Tram Service', null],
+	[ '906',  '0', 'All Tram Services', null],
+	['1000',  '4', 'Water Transport Service', null],
+	['1100',  '6', 'Air Service', null],
+	['1200',  '4', 'Ferry Service', null],
+	['1300',  '6', 'Aerial Lift Service', 'Telefèric de Montjuïc (ES), Saleve (CH), Roosevel, foot Island Tramway (US)', null],
+	['1400',  '7', 'Funicular Service', 'Rigiblick (Zürich, CH)'],
+	['1500', null, 'Taxi Service', null],
+	['1501', null, 'Communal Taxi Service', 'Marshrutka (RU), dolmuş (TR)'],
+	['1502',  '4', 'Water Taxi Service', null],
+	['1503',  '0', 'Rail Taxi Service', null],
+	['1504', null, 'Bike Taxi Service', null],
+	['1505', null, 'Licensed Taxi Service', null],
+	['1506', null, 'Private Hire Service Vehicle', null],
+	['1507', null, 'All Taxi Services', null],
+	['1700', null, 'Miscellaneous Service', null],
+	['1702', null, 'Horse-drawn Carriage', null],
 ]
 
 // proposed TPEG-PTI-derived route types
 // https://groups.google.com/g/gtfs-changes/c/keT5rTPS7Y0/m/71uMz2l6ke0J
 const tpegPtiExtendedRouteTypes = [
-	['100', 'Railway Service'],
-	['101', 'High Speed Rail Service'],
-	['102', 'Long Distance Trains'],
-	['103', 'Inter Regional Rail Service'],
-	['104', 'Car Transport Rail Service'],
-	['105', 'Sleeper Rail Service'],
-	['106', 'Regional Rail Service'],
-	['107', 'Tourist Railway Service'],
-	['108', 'Rail Shuttle (Within Complex)'],
-	['109', 'Suburban Railway'],
-	['110', 'Replacement Rail Service'],
-	['111', 'Special Rail Service'],
-	['112', 'Lorry Transport Rail Service'],
-	['113', 'All Rail Services'],
-	['114', 'Cross-Country Rail Service'],
-	['115', 'Vehicle Transport Rail Service'],
-	['116', 'Rack and Pinion Railway'],
-	['117', 'Additional Rail Service'],
+	[ '100',  '2', 'Railway Service'],
+	[ '101',  '2', 'High Speed Rail Service'],
+	[ '102',  '2', 'Long Distance Trains'],
+	[ '103',  '2', 'Inter Regional Rail Service'],
+	[ '104',  '2', 'Car Transport Rail Service'],
+	[ '105',  '2', 'Sleeper Rail Service'],
+	[ '106',  '2', 'Regional Rail Service'],
+	[ '107',  '2', 'Tourist Railway Service'],
+	[ '108',  '0', 'Rail Shuttle (Within Complex)'],
+	[ '109',  '0', 'Suburban Railway'],
+	[ '110',  '0', 'Replacement Rail Service'],
+	[ '111',  '2', 'Special Rail Service'],
+	[ '112',  '0', 'Lorry Transport Rail Service'],
+	[ '113',  '2', 'All Rail Services'],
+	[ '114',  '2', 'Cross-Country Rail Service'],
+	[ '115',  '2', 'Vehicle Transport Rail Service'],
+	[ '116',  '0', 'Rack and Pinion Railway'],
+	[ '117',  '0', 'Additional Rail Service'],
 
-	['200', 'Coach Service'],
-	['201', 'International Coach Service'],
-	['202', 'National Coach Service'],
-	['203', 'Shuttle Coach Service'],
-	['204', 'Regional Coach Service'],
-	['205', 'Special Coach Service'],
-	['206', 'Sightseeing Coach Service'],
-	['207', 'Tourist Coach Service'],
-	['208', 'Commuter Coach Service'],
-	['209', 'All Coach Services'],
+	[ '200',  '3', 'Coach Service'],
+	[ '201',  '3', 'International Coach Service'],
+	[ '202',  '3', 'National Coach Service'],
+	[ '203',  '3', 'Shuttle Coach Service'],
+	[ '204',  '3', 'Regional Coach Service'],
+	[ '205',  '3', 'Special Coach Service'],
+	[ '206',  '3', 'Sightseeing Coach Service'],
+	[ '207',  '3', 'Tourist Coach Service'],
+	[ '208',  '3', 'Commuter Coach Service'],
+	[ '209',  '3', 'All Coach Services'],
 
-	['300', 'Suburban Railway Service'],
+	[ '300',  '0', 'Suburban Railway Service'],
 
-	['400', 'Urban Railway Service'],
-	['401', 'Metro Service'],
-	['402', 'Underground Service'],
-	['403', 'Urban Railway Service'],
-	['404', 'All Urban Railway Services'],
+	[ '400',  '0', 'Urban Railway Service'],
+	[ '401',  '0', 'Metro Service'],
+	[ '402',  '0', 'Underground Service'],
+	[ '403',  '0', 'Urban Railway Service'],
+	[ '404',  '0', 'All Urban Railway Services'],
 
-	['500', 'Metro Service'],
+	[ '500',  '0', 'Metro Service'],
 
-	['600', 'Underground Service'],
+	[ '600',  '0', 'Underground Service'],
 
-	['700', 'Bus Service'],
-	['701', 'Regional Bus Service'],
-	['702', 'Express Bus Service'],
-	['703', 'Stopping Bus Service'],
-	['704', 'Local Bus Service'],
-	['705', 'Night Bus Service'],
-	['706', 'Post Bus Service'],
-	['707', 'Special Needs Bus'],
-	['708', 'Mobility Bus Service'],
-	['709', 'Mobility Bus for Registered Disabled'],
-	['710', 'Sightseeing Bus'],
-	['711', 'Shuttle Bus'],
-	['712', 'School Bus'],
-	['713', 'School and Public Service Bus'],
-	['714', 'Rail Replacement Bus Service'],
-	['715', 'Demand and Response Bus Service'],
-	['716', 'All Bus Services'],
+	[ '700',  '3', 'Bus Service'],
+	[ '701',  '3', 'Regional Bus Service'],
+	[ '702',  '3', 'Express Bus Service'],
+	[ '703',  '3', 'Stopping Bus Service'],
+	[ '704',  '3', 'Local Bus Service'],
+	[ '705',  '3', 'Night Bus Service'],
+	[ '706',  '3', 'Post Bus Service'],
+	[ '707',  '3', 'Special Needs Bus'],
+	[ '708',  '3', 'Mobility Bus Service'],
+	[ '709',  '3', 'Mobility Bus for Registered Disabled'],
+	[ '710',  '3', 'Sightseeing Bus'],
+	[ '711',  '3', 'Shuttle Bus'],
+	[ '712',  '3', 'School Bus'],
+	[ '713',  '3', 'School and Public Service Bus'],
+	[ '714',  '3', 'Rail Replacement Bus Service'],
+	[ '715',  '3', 'Demand and Response Bus Service'],
+	[ '716',  '3', 'All Bus Services'],
 
-	['800', 'Trolleybus Service'],
+	[ '800', '11', 'Trolleybus Service'],
 
-	['900', 'Tram Service'],
-	['901', 'City Tram Service'],
-	['902', 'Local Tram Service'],
-	['903', 'Regional Tram Service'],
-	['904', 'Sightseeing Tram Service'],
-	['905', 'Shuttle Tram Service'],
-	['906', 'All Tram Services'],
+	[ '900',  '0', 'Tram Service'],
+	[ '901',  '0', 'City Tram Service'],
+	[ '902',  '0', 'Local Tram Service'],
+	[ '903',  '0', 'Regional Tram Service'],
+	[ '904',  '0', 'Sightseeing Tram Service'],
+	[ '905',  '0', 'Shuttle Tram Service'],
+	[ '906',  '0', 'All Tram Services'],
 
-	['1000', 'Water Transport Service'],
-	['1001', 'International Car Ferry Service'],
-	['1002', 'National Car Ferry Service'],
-	['1003', 'Regional Car Ferry Service'],
-	['1004', 'Local Car Ferry Service'],
-	['1005', 'International Passenger Ferry Service'],
-	['1006', 'National Passenger Ferry Service'],
-	['1007', 'Regional Passenger Ferry Service'],
-	['1008', 'Local Passenger Ferry Service'],
-	['1009', 'Post Boat Service'],
-	['1010', 'Train Ferry Service'],
-	['1011', 'Road-Link Ferry Service'],
-	['1012', 'Airport-Link Ferry Service'],
-	['1013', 'Car High-Speed Ferry Service'],
-	['1014', 'Passenger High-Speed Ferry Service'],
-	['1015', 'Sightseeing Boat Service'],
-	['1016', 'School Boat'],
-	['1017', 'Cable-Drawn Boat Service'],
-	['1018', 'River Bus Service'],
-	['1019', 'Scheduled Ferry Service'],
-	['1020', 'Shuttle Ferry Service'],
-	['1021', 'All Water Transport Services'],
+	['1000',  '4', 'Water Transport Service'],
+	['1001',  '4', 'International Car Ferry Service'],
+	['1002',  '4', 'National Car Ferry Service'],
+	['1003',  '4', 'Regional Car Ferry Service'],
+	['1004',  '4', 'Local Car Ferry Service'],
+	['1005',  '4', 'International Passenger Ferry Service'],
+	['1006',  '4', 'National Passenger Ferry Service'],
+	['1007',  '4', 'Regional Passenger Ferry Service'],
+	['1008',  '4', 'Local Passenger Ferry Service'],
+	['1009',  '4', 'Post Boat Service'],
+	['1010',  '4', 'Train Ferry Service'],
+	['1011',  '4', 'Road-Link Ferry Service'],
+	['1012',  '4', 'Airport-Link Ferry Service'],
+	['1013',  '4', 'Car High-Speed Ferry Service'],
+	['1014',  '4', 'Passenger High-Speed Ferry Service'],
+	['1015',  '4', 'Sightseeing Boat Service'],
+	['1016',  '4', 'School Boat'],
+	['1017',  '4', 'Cable-Drawn Boat Service'],
+	['1018',  '4', 'River Bus Service'],
+	['1019',  '4', 'Scheduled Ferry Service'],
+	['1020',  '4', 'Shuttle Ferry Service'],
+	['1021',  '4', 'All Water Transport Services'],
 
-	['1100', 'Air Service'],
-	['1101', 'International Air Service'],
-	['1102', 'Domestic Air Service'],
-	['1103', 'Intercontinental Air Service'],
-	['1104', 'Domestic Scheduled Air Service'],
-	['1105', 'Shuttle Air Service'],
-	['1106', 'Intercontinental Charter Air Service'],
-	['1107', 'International Charter Air Service'],
-	['1108', 'Round-Trip Charter Air Service'],
-	['1109', 'Sightseeing Air Service'],
-	['1110', 'Helicopter Air Service'],
-	['1111', 'Domestic Charter Air Service'],
-	['1112', 'Schengen-Area Air Service'],
-	['1113', 'Airship Service'],
-	['1114', 'All Air Services'],
+	['1100', null, 'Air Service'],
+	['1101', null, 'International Air Service'],
+	['1102', null, 'Domestic Air Service'],
+	['1103', null, 'Intercontinental Air Service'],
+	['1104', null, 'Domestic Scheduled Air Service'],
+	['1105', null, 'Shuttle Air Service'],
+	['1106', null, 'Intercontinental Charter Air Service'],
+	['1107', null, 'International Charter Air Service'],
+	['1108', null, 'Round-Trip Charter Air Service'],
+	['1109', null, 'Sightseeing Air Service'],
+	['1110', null, 'Helicopter Air Service'],
+	['1111', null, 'Domestic Charter Air Service'],
+	['1112', null, 'Schengen-Area Air Service'],
+	['1113', null, 'Airship Service'],
+	['1114', null, 'All Air Services'],
 
-	['1200', 'Ferry Service'],
+	['1200',  '4', 'Ferry Service'],
 
-	['1300', 'Telecabin Service'],
-	['1301', 'Telecabin Service'],
-	['1302', 'Cable Car Service'],
-	['1303', 'Elevator Service'],
-	['1304', 'Chair Lift Service'],
-	['1305', 'Drag Lift Service'],
-	['1306', 'Small Telecabin Service'],
-	['1307', 'All Telecabin Services'],
+	['1300',  '6', 'Telecabin Service'],
+	['1301',  '6', 'Telecabin Service'],
+	['1302',  '6', 'Cable Car Service'],
+	['1303',  '6', 'Elevator Service'],
+	['1304',  '6', 'Chair Lift Service'],
+	['1305',  '6', 'Drag Lift Service'],
+	['1306',  '6', 'Small Telecabin Service'],
+	['1307',  '6', 'All Telecabin Services'],
 
-	['1400', 'Funicular Service'],
-	['1401', 'Funicular Service'],
-	['1402', 'All Funicular Service'],
+	['1400',  '7', 'Funicular Service'],
+	['1401',  '7', 'Funicular Service'],
+	['1402',  '7', 'All Funicular Service'],
 
-	['1500', 'Taxi Service'],
-	['1501', 'Communal Taxi Service'],
-	['1502', 'Water Taxi Service'],
-	['1503', 'Rail Taxi Service'],
-	['1504', 'Bike Taxi Service'],
-	['1505', 'Licensed Taxi Service'],
-	['1506', 'Private Hire Service Vehicle'],
-	['1507', 'All Taxi Services'],
+	['1500', null, 'Taxi Service'],
+	['1501', null, 'Communal Taxi Service'],
+	['1502',  '4', 'Water Taxi Service'],
+	['1503',  '2', 'Rail Taxi Service'],
+	['1504', null, 'Bike Taxi Service'],
+	['1505', null, 'Licensed Taxi Service'],
+	['1506', null, 'Private Hire Service Vehicle'],
+	['1507', null, 'All Taxi Services'],
 
-	['1600', 'Self Drive'],
-	['1601', 'Hire Car'],
-	['1602', 'Hire Van'],
-	['1603', 'Hire Motorbike'],
-	['1604', 'Hire Cycle'],
-	['1605', 'All Self-Drive Vehicles'],
+	['1600', null, 'Self Drive'],
+	['1601', null, 'Hire Car'],
+	['1602', null, 'Hire Van'],
+	['1603', null, 'Hire Motorbike'],
+	['1604', null, 'Hire Cycle'],
+	['1605', null, 'All Self-Drive Vehicles'],
 ]
 
 const routeTypesSchemes = Object.assign(Object.create(null), {
@@ -231,6 +231,10 @@ const routeTypesSchemes = Object.assign(Object.create(null), {
 	'tpeg-pti': tpegPtiExtendedRouteTypes,
 })
 
+const formatRouteType = (route_type) => {
+	return route_type === null ? 'NULL' : `'${route_type}'`
+}
+
 // https://gtfs.org/schedule/reference/#routestxt
 const beforeAll = (opt) => {
 	if (!(opt.routeTypesScheme in routeTypesSchemes)) {
@@ -239,26 +243,31 @@ const beforeAll = (opt) => {
 	const extRouteTypes = routeTypesSchemes[opt.routeTypesScheme]
 
 	return `\
-CREATE TYPE "${opt.schema}".route_type_val AS ENUM (
+CREATE TABLE "${opt.schema}".route_types (
+	route_type TEXT PRIMARY KEY,
+	basic_route_type TEXT,
+	FOREIGN KEY (basic_route_type) REFERENCES "${opt.schema}".route_types (route_type)
+);
+
+INSERT INTO "${opt.schema}".route_types (
+	route_type,
+	basic_route_type
+) VALUES
 	-- basic types
-	'0' -- 0 – Tram, Streetcar, Light rail. Any light rail or street level system within a metropolitan area.
-	, '1' -- 1 – Subway, Metro. Any underground rail system within a metropolitan area.
-	, '2' -- 2 – Rail. Used for intercity or long-distance travel.
-	, '3' -- 3 – Bus. Used for short- and long-distance bus routes.
-	, '4' -- 4 – Ferry. Used for short- and long-distance boat service.
-	, '5' -- 5 – Cable tram. Used for street-level rail cars where the cable runs beneath the vehicle, e.g., cable car in San Francisco.
-	, '6' -- 6 – Aerial lift, suspended cable car (e.g., gondola lift, aerial tramway). Cable transport where cabins, cars, gondolas or open chairs are suspended by means of one or more cables.
-	, '7' -- 7 – Funicular. Any rail system designed for steep inclines.
-	, '11' -- 11 – Trolleybus. Electric buses that draw power from overhead wires using poles.
-	, '12' -- 12 – Monorail. Railway in which the track consists of a single rail or a beam.
+	  ( '0',  '0') -- Tram, Streetcar, Light rail. Any light rail or street level system within a metropolitan area.
+	, ( '1',  '1') -- Subway, Metro. Any underground rail system within a metropolitan area.
+	, ( '2',  '2') -- Rail. Used for intercity or long-distance travel.
+	, ( '3',  '3') -- Bus. Used for short- and long-distance bus routes.
+	, ( '4',  '4') -- Ferry. Used for short- and long-distance boat service.
+	, ( '5',  '5') -- Cable tram. Used for street-level rail cars where the cable runs beneath the vehicle, e.g., cable car in San (Francisco.
+	, ( '6',  '6') -- Aerial lift, suspended cable car (e.g., gondola lift, aerial tramway). Cable transport where cabins, cars, (gondolas or open chairs are suspended by means of one or more cables.
+	, ( '7',  '7') -- Funicular. Any rail system designed for steep inclines.
+	, ('11', '11') -- Trolleybus. Electric buses that draw power from overhead wires using poles.
+	, ('12', '12') -- Monorail. Railway in which the track consists of a single rail or a beam.
 
 	-- extended types
-${extRouteTypes.map(([route_type, desc]) => `, '${route_type}' -- ${desc}`).join('\n')}
-);
--- todo [breaking]: use small table as enum? https://www.graphile.org/postgraphile/enums/#with-enum-tables
-${opt.postgraphile ? `\
-COMMENT ON TYPE "${opt.schema}".route_type_val IS E'@enum\\n@enumName RouteType\\n';
-` : ''}
+${extRouteTypes.map(([route_type, basic_route_type, desc]) => `\t, (${formatRouteType(route_type)}, ${formatRouteType(basic_route_type)}) -- ${desc}`).join('\n')}
+;
 
 CREATE TABLE "${opt.schema}".routes (
 	route_id TEXT PRIMARY KEY,
@@ -268,7 +277,8 @@ CREATE TABLE "${opt.schema}".routes (
 	route_short_name TEXT,
 	route_long_name TEXT,
 	route_desc TEXT,
-	route_type "${opt.schema}".route_type_val NOT NULL,
+	route_type TEXT NOT NULL,
+	FOREIGN KEY (route_type) REFERENCES "${opt.schema}".route_types,
 	route_url TEXT,
 	route_color TEXT,
 	route_text_color TEXT,