《资治通鉴·陈纪·陈纪十》
隋朝全国各地每年上调给中央的各种物资，黄河以南的经由潼关，黄河以北的经由蒲坂，向长安运输的车辆接连不断，昼夜不停，前后长达数月之久。
诸州调物，每岁河南自潼关，河北自蒲坂，输长安者相属于路，昼夜不绝者数月。
Various goods from all over the Sui Empire were transported to the capital each year. Those from south of the Yellow River passed through Tongguan, and those from north of the Yellow River passed through Puban. The vehicles transporting these goods to Chang'an were endless and traveled day and night for several months.