Harappan urban planning was sophisticated, featuring a grid layout in major cities where main roads intersected at right angles. However, this was not universally applied to all roads and lanes within the city, and smaller streets or those in less prominent areas were not always perfectly straight or right- angled. Thus, statement 1 is correct. A highly distinctive feature of the Harappan civilization was the remarkable uniformity and standardization of brick sizes (typically in the ratio 1:2:4 for thickness, width, and length) used for construction across different sites, for both houses and city walls. This demonstrates advanced planning and organization, making statement 2 correct.