Distinguishing Long-distance bus routes

In many parts of the world buses are the main ways of travelling long distances. Some simple examples: Rio Gallegos to El Calafate (one of several), St Petersburg to Riga, Kuala Lumpur to Ipoh, Madrid to most towns & cities in Spain. Often these long distance routes are operated very differently from regular local services: infrequent stops, higher quality seating, in-service refreshments etc.

Is there any tag or set of tags which allows one to distinguish local, regional, national and international level bus services?