GTFS Spec: route_sort_order field in routes.txt : Optional, The route_sort_order field can be used to order the routes in a way which is ideal for presentation to customers. It must be a non-negative integer. Routes with smaller route_sort_order values should be displayed before routes with larger route_sort_order values.
Suggestion: Display routes table sorted by this if present, and mention this column in tabulator routes table so user can set a value. Set validation to non-negative integer.
GTFS Spec:
route_sort_orderfield in routes.txt :Optional, The route_sort_order field can be used to order the routes in a way which is ideal for presentation to customers. It must be a non-negative integer. Routes with smaller route_sort_order values should be displayed before routes with larger route_sort_order values.Suggestion: Display routes table sorted by this if present, and mention this column in tabulator routes table so user can set a value. Set validation to non-negative integer.