चतुर्दण्डान्तरा रथ्याः ॥ कZ_०२.४.०३ ॥
caturdaṇḍāntarā rathyāḥ
The streets (rathyāḥ) should have an interval/width of four daṇḍas.
To prevent encroachment, ensure cart/military movement, reduce fire risk, and make enforcement objective through measurable standards.