1. Limited travellers
2. Occasional travellers
3. Regular travellers
4. Extensive travellers

Эти названия встречается и расшифровываются в следующем контексте:

Nolan proposes four types of travellers:
(a) Limited travellers, who generally travel to fulfill an obligation or out of necessity.
(b) Occasional travellers. Members of this group take infrequent vacations and often mix obligation with recreation. Occasional travellers consider their infrequent vacations the highlight of their lives.
(c) Regular travellers. This group tends to travel often but usually to the same place.
(d) Extensive travellers, who genuinely enjoy travel and usually manage to convert their travel to economic gain (for example, by lecturing on their trips).

Заранее спасибо!

1. Limited travellers - неактивные путешественники (1-2 раза в год)
2. Occasional travellers - эпизодические путешественники
3. Regular travellers - регулярные/постоянные путешественники
4. Extensive travellers - активные путешественники