तस्करामित्राभ्यागमे शङ्खदुन्दुभिशब्दमग्राह्याः कुर्युः शैलवृक्षाधिरूढा वा शीघ्रवाहना वा ॥ कZ_०२.३४.१० ॥
taskarāmitrābhyāgame śaṅkhadundubhiśabdam agrāhyāḥ kuryuḥ śailavṛkṣādhirūḍhā vā śīghravāhanā vā
On the approach of bandits or an enemy, they shall raise an alarm by conch and drum signals; they may do so from hills or atop trees, or by swift-mounted messengers.
A low-cost, redundant mass-notification system that works without literacy or complex infrastructure, enabling coordinated response across dispersed settlements.
It combines line-of-sight broadcasting (elevated alarms) with point-to-point transmission (couriers), improving reliability and speed.