Kautilya's Arthashastra 2.28.17

2.28.17

kaivartakāṣṭatṛṇabhārapuṣpaphalavāṭaṣaṇḍa.gopālakānām anatyayaḥ, sambhāvyadūtānupātināṃ ca senābhāṇḍaprayogāṇāṃ ca svataraṇais taratām, bījabhaktadravyopaskarāṃś cānūpagrāmāṇāṃ tārayatām //

Fishermen, carriers of firewood, grass, flowers, and fruits, gardeners, vegetable-dealers, and herdsmen, persons pursuing suspected criminals, messengers following other messengers going in advance, servants engaged to carry things, provisions, and orders to the army, those who use their own ferries, as well as those who supply villages of marshy districts with seeds, necessaries of life, commodities and other accessary things shall be exempted (to cross rivers at any time and place).