 In traditional weddings, the bride and groom are carried to the ceremony in separate gamas.Because of the difficulties posed by the mountainous terrain of the Korean peninsula and the lack of paved roads, gamas were preferred over wheeled vehicles.As the population of Japan increased and less and less land remained available for the grazing of animals, restrictions were placed upon the use of horses for non-military purposes, with the result that human-powered transport grew increasingly important and eventually came to prevail.