शुल्काध्यक्षः शुल्कशालां ध्वजं च प्रान्मुखमुदन्मुखं वा महाद्वाराभ्याशे निवेशयेत् ॥ कZ_०२.२१.०१ ॥
śulkādhyakṣaḥ śulkaśālāṃ dhvajaṃ ca prānmukham udanmukhaṃ vā mahādvārābhyāśe niveśayet
The Superintendent of Customs should establish the customs-house, and also a flag (signal), facing east or facing north, near the main gate.
It concentrates inspection at the chokepoint where goods and traders must pass, improving compliance and reducing evasion.
It acts as a visible state signal marking the official point of assessment/inspection, guiding traders and legitimizing enforcement.
It standardizes public architecture and procedure—reducing ambiguity and reinforcing uniformity of state practice across towns.