Matsya Purana — Solar–Lunar Motions
स्मृतास्तिस्रस्तु वीथ्यस्ता मार्गे वै दक्षिणे पुनः काष्ठयोरन्तरं चैतद् वक्ष्यते योजनैः पुनः //
smṛtāstisrastu vīthyastā mārge vai dakṣiṇe punaḥ kāṣṭhayorantaraṃ caitad vakṣyate yojanaiḥ punaḥ //
Traditionally, three streets (vīthīs) are again prescribed on the southern side of the main road; and the interval between the two boundary-lines (kāṣṭhā) of these will again be stated in yojanas.
This verse does not discuss Pralaya; it belongs to the Matsya Purana’s Vastuvidyā material, focusing on civic layout—streets, sides of a road, and distance units.
It supports the king’s duty of orderly settlement planning—defining streets and regulated spacing—so that towns function safely and predictably; it also guides householders indirectly by standardizing access routes and boundaries.
Architecturally, it specifies a planned arrangement of three lanes on the southern side of a main road and promises precise spacing between boundary markers, expressed in yojanas—key for standardized town/precinct design.