How did Harappan cities differ from modern cities?

Harappan cities differed from modern cities in several ways. While modern cities often have high-rise buildings and complex transportation systems, Harappan cities were characterized by well-planned streets, houses made of baked bricks, and advanced drainage systems. They had a grid-like layout with separate residential and public areas. Unlike modern cities that rely heavily on motor vehicles, Harappan cities had narrow lanes, and their roads were mainly used for foot traffic. Moreover, Harappans didn’t have modern amenities like electricity and machinery, yet they developed impressive urban infrastructure.

This question related to Chapter 6 Social Science Class 6th NCERT.
From the Chapter 6. The Beginnings of Indian Civilisation.
Give answer according to your understanding.