Explanation: The Indus Valley Civilization, which flourished around 2600-1900 BCE, is renowned for its advanced urban planning and architectural achievements, particularly in the cities of Mohenjo Daro and Harappa. One of the most distinctive features of these ancient cities was the layout of their streets, which were arranged in a grid-like fashion. This grid layout was a significant advancement in urban planning, providing a structured and organized framework for the city.
The grid layout facilitated efficient traffic flow and urban management. The streets intersected at right angles, creating a network of blocks that were uniform in size. This layout allowed for easy navigation and helped in the systematic development of the city. The grid system also enabled the city planners to allocate space for various functions such as residential areas, public buildings, and commercial zones.
In contrast to the grid layout, the other options presented in the question do not accurately describe the unique features of Mohenjo Daro and Harappa. Subways, or underground transportation systems, were not present in ancient cities. These were modern inventions that came much later in human history. Similarly, asphalt paving, a modern technique for road construction, was not used in ancient times. The streets in these ancient cities were made of brick or stone. Lastly, road signs as we know them today were not present in ancient cities. The grid-like layout of the streets was the primary feature that facilitated navigation and urban management.
Understanding the grid layout of Mohenjo Daro and Harappa provides insight into the advanced urban planning and architectural skills of the Indus Valley Civilization. This layout was a testament to the sophisticated planning and organizational abilities of the ancient inhabitants, showcasing their ability to create well-structured and functional urban environments.