These mail-wagons were two-wheeled cabriolets, upholstered inside with fawn-colored leather, hung on springs, and having but two seats, one for the postboy, the other for the traveller.
The term caravan was used to describe groups of people who travelled together across the ancient network for safety reasons, such as merchants, travellers or pilgrims.
The word " caravanserai" is a combination of the Persian words " karvan" , which means a group of travellers or a caravan, and " saray" , a palace or enclosed building.