Because the all above three option road had the proper finished surface of bituminous so un surface means no proper bitumin provided at this odr and vr

The Nagpur plan, also known as the Nagpur Road Plan, was a comprehensive road development plan formulated in the 1940s for the province of Central Provinces and Berar in British India. It aimed to improve the road infrastructure and connectivity in the region.

The plan divided the road network into different categories based on their importance and traffic volume. The unsurfaced roads, which were not paved or metalled, were categorized as "Other district road and village road" and were given the highest priority for improvement and development. Let's understand why these roads were given such importance:

1. Importance of District Roads:
- District roads are the lifeline of rural areas, connecting villages, towns, and cities within a district.
- They are crucial for the transportation of agricultural produce, goods, and services to and from the rural areas.
- District roads also provide access to schools, healthcare facilities, and other essential services for the rural population.

2. Importance of Village Roads:
- Village roads are the smallest and most basic road network, connecting individual villages to the nearest district roads.
- They play a vital role in providing connectivity to remote and isolated rural areas.
- Village roads facilitate the movement of people, goods, and services within the village and with neighboring villages.
- They are particularly important for agricultural activities, as they enable farmers to transport their produce to markets and access farming inputs.

3. Lack of Surfacing:
- Unsurfaced roads refer to roads that do not have a hard, paved surface like asphalt or concrete.
- These roads are usually made of natural materials such as gravel, soil, or a mixture of both.
- The lack of surfacing makes these roads prone to erosion, dust generation, and poor riding quality.

4. Need for Improvement:
- The Nagpur plan recognized the urgent need to improve the unsurfaced roads for better connectivity and accessibility.
- Upgrading these roads to a surfaced condition would enhance their durability, all-weather performance, and ability to handle increased traffic volumes.
- The surfacing would also provide a smoother and safer travel experience for the users.

Therefore, considering the importance of district roads and village roads in rural areas and the need to improve their condition, the Nagpur plan categorized unsurfaced roads as "Other district road and village road" and prioritized their development. This decision aimed to uplift the rural areas, promote economic growth, and improve the overall quality of life for the rural population.