Except for Emperor Xuanzong's personal preference, the game between old aristocratic and civil officials for their own interests is also the reason for it.
这里面既是唐玄宗个人喜好使然,但也是旧贵族与新兴的文官集团为了各自的利益展开博弈的结果。
Because of its prestige and sanctity, when passing the gateway, the civil officials shall go down the sedan chair and the military officers shall get down from the horse.