What would be the recommended way to represent such a custom presentation order for routes in GTFS?

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We are working on a passenger-facing application where routes need to be grouped and displayed according to their transport mode and submode. We would like to define a specific presentation priority for these categories, independently of the individual route ordering.

In our use case, we want to group and display routes according to their transport route_type, with a specific business-defined priority.

For example, we would like routes with route_type=200 be displayed first, followed by route_type = 712, etc...

Does GTFS provide a standard mechanism to define such a presentation order ?

We are aware of routes.route_sort_order, but this appears to define the order of individual routes rather than the priority of route categories. Would route_sort_order be the appropriate mechanism for this use case, or is there another recommended approach?

Thanks,
Pauline

Start by reviewing the GTFS documentation for routes.route_type and routes.route_sort_order, then check whether the specification describes category-level presentation priorities. Done means providing a documented recommendation that directly addresses the example ordering and explains whether an existing field applies.

Written by the indexing model from the issue text.