The streets and houses of Harappan cities were once through to be laid on a grid pattern oriented north-south and east-west. Actually, even Mohenjodaro does not show a perfect grid system.
Roads were not always absolutely straight and did not always cross one another at right angles. But the settlements were clearly planned.
No strict correlation between the level of planning and the size of a settlement. For example, the relatively small site of Lothal shows a much higher level of planning than kalibangan, which is twice its size.
The details of the plans differ:
Mohenjodaro, Harappa and Kalibangan have a similar layout, consisting of a raised citadeh complex and a lower city.
At Lothal and Surkotada, the citadel complex is not separate; it is located within the main settlement.
Dholavira consisted of not two but three parts- the citadel, middle town and lower town.
