The History of Shēr Shāh (Tārīkh-i Shērshāhī) 4.2.6

4.2.6

In the middle of every saráí was a well and a masjid of burnt brick; and he placed an imám and a mua'zzin in every masjid, together with a custodian (shahna), and several watchmen; and all these were maintained from the land near the saráí. In every saráí two horses were kept, that they might quickly carry news. I have heard that Husain Tashtdár once, on an emergency, rode 300 kos in one day. On both sides of the highway Sher Sháh planted fruit-bearing trees, such as also gave much shade, that in the hot wind travellers might go along under the trees; and if they should stop by the way, might rest and take repose. If they put up at a saráí, they bound their horses under the trees.