द्वयोरट्टालकयोर्मध्ये सहर्म्यद्वितलामध्यर्धायायामां प्रतोलीं कारयेत् ॥ कZ_०२.३.११ ॥
dvayor aṭṭālakayor madhye saharmyadvitalāmadhyardhāyāyāmāṃ pratolīṃ kārayet
二つの見張り塔の間には、上部構造(部屋を備える)と一体化した門楼(pratolī)を築くべきであり、二階建てで、規定の中間/半長の寸法とする。
It allows cross-coverage of the gate by defenders from both sides, turning entry into a controllable and punishable chokepoint.