त्रयः प्राचीना राजमार्गास्त्रय उदीचीना इति वास्तुविभागः ॥ कZ_०२.४.०१ ॥
trayaḥ prācīnā rājamārgās traya udīcīnā iti vāstuvibhāgaḥ
城镇规划的划分是:三条向东延伸的王道和三条向北延伸的王道。
A fixed arterial grid simplifies policing, taxation movement, military mobilization, and maintenance budgeting by making circulation predictable and inspectable.
They are state-priority corridors for administration, trade supervision, and rapid troop/police movement—hence centrally planned and regulated.