द्वयोरट्टालकयोर्मध्ये सहर्म्यद्वितलामध्यर्धायायामां प्रतोलीं कारयेत् ॥ कZ_०२.३.११ ॥
dvayor aṭṭālakayor madhye saharmyadvitalāmadhyardhāyāyāmāṃ pratolīṃ kārayet
在两座瞭望塔之间,应建造一座门楼(pratolī),与上部建筑(设有房间)相连,为两层,并按规定的中间/半长尺寸建造。
It allows cross-coverage of the gate by defenders from both sides, turning entry into a controllable and punishable chokepoint.