द्वादशपणममुद्रो जानपदो दद्यात् ॥ कZ_०२.३४.०३ ॥
dvādaśapaṇam amudro jānapado dadyāt
An inland resident (non-maritime traveller) should pay twelve paṇas for a pass (i.e., when issued without the ‘samudra’ category).
Differential pricing to segment movement/transactions: the state can encourage, discourage, or more closely monitor certain classes of travellers while funding enforcement.