《北史·列传·卷三十一》
下诏规定，君主在太极殿，大臣入宫，传呼开道至止车门；君主在朝堂，传呼开道至司马门。
下诏御在太极，驺唱至止车门；御在朝堂，至司马门。
A decree stipulated that when the Monarch was in the Taiji Hall and a minister entered the palace, the announcement to clear the way had to stop at the carriage door; when the Monarch was in the court, the announcement to clear the way had to stop at the Sima Gate.