All About Road carriageway width in India as per IRC

All About Road carriageway width in India as per IRC

Roads play a crucial role in connecting people and goods to various parts of the country. In India, the road network is constantly expanding and evolving to accommodate the growing population and economy. The Indian Roads Congress (IRC) is the apex body for setting standards and guidelines for the construction and maintenance of roads in the country. One of the key aspects that determine the quality and safety of roads is the carriageway width. In this article, we will delve into the details of carriageway width as per IRC guidelines in India, its importance in road design and maintenance, and its impact on traffic flow and safety.

Road carriageway width in India as per IRC

Road carriageway width in India as per IRC

Road carriageway width is an essential factor in the design and construction of roads in India. It refers to the pavement or surface area of a road that is used for vehicular traffic. The Indian Roads Congress (IRC) is a premier technical body that formulates standards, guidelines, and specifications for road and bridge engineering in the country. The IRC has set minimum requirements for roadway widths based on various factors such as the type of road, traffic volume, and future development of the area.

As per the latest IRC guidelines, the minimum carriageway width for a single lane road is 3.75 meters, while for intermediate lanes, it is 3.5 meters. For a double lane road, the minimum width should be 7 meters, while for four-lane roads, it is 10.5 meters. In case of six-lane roads, the minimum carriageway width is 17.5 meters, and for eight-lane roads, it is 22 meters.

However, these minimum requirements may not be sufficient for all types of roads. The IRC also takes into consideration various factors such as the terrain, road alignment, and the type of vehicles using the road while determining the recommended carriageway width for different types of roads.

In hilly or mountainous regions, the minimum carriageway width may be increased by 0.5 to 1 meter due to the steep terrain. Similarly, in urban areas with heavy traffic, the recommended carriageway width may be increased to accommodate the flow of vehicles.

Moreover, for different types of vehicles, the IRC has also recommended specific carriageway widths. For example, for roads with heavy truck traffic, the minimum carriageway width should be 3 meters, while for highways with light vehicle traffic, it can be reduced to 2.75 meters. Additionally, the width of the carriageway is also determined based on the design speed of the road, with higher design speeds requiring wider carriageways.

It is important to note that the carriageway width is not the same as the total width of the roadway. The road also includes other components such as shoulders, sidewalks, cycle tracks, and median. These components may vary in width depending on the type of road and its location.

The IRC plays a crucial role in ensuring the safety and efficiency of roads in India by setting standards for road carriageway width. Roads built as per these standards can accommodate a larger volume of traffic, reduce congestion, and provide a smoother and safer travel experience for all road users.


In conclusion, the Indian Roads Congress (IRC) has set specific standards for road carriageway width in India. These standards take into consideration various factors such as traffic volume, terrain, and safety measures. It is vital to adhere to these standards to ensure the smooth flow of traffic and minimize accidents on Indian roads. As the country continues to develop and expand its road infrastructure, it is essential for both government agencies and private developers to follow IRC guidelines to create safe and efficient roads. By understanding and implementing these standards, we can contribute towards improving the overall road network and creating a better driving experience for all. Let’s strive towards achieving IRC’s recommended road carriageway width for a better and safer India.


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