National Highways : They connect the capitals of the states, Industrial centres and major parts. They are well planned wide roads with two-lane, four-lane and six-lane roads.

• Construction and maintainance is done by the Central Government and National Highways Authority (NHAI). The total length of the National Highway is about 71,772 km in 2011. They constitute only 2% of the length but they carry over 45% of the road traffic:
• The number of National Highways in the country is 235.

Under the National Highways Authority of India, about 14,297 km length of National high way is proposed to be upgraded to four or six lanes in two phases.

It consists of the following components :

• The Golden Quadrilateral 
• The North-South and East-West corridors 
• Port connectivity and other projects.

1. The Golden Quadrilateral super Highways Kolkata, Chennai Mumbai and by six-lane super highway. It has a total length of 5846 kms.

2. East-West corridor :- This project has extended from the North South corridor linking between Srinagar (J.K) and Kanyakumari (T.N) and East-West corriders connecting between Silcher (Assam) and Porbandar (Gujarat). The project has a total length of about 7300 km.

3. Port connectivity project:-This project, connect golden quadrilateral roads with 3 major ports (380 km) and other projects (962 km) is in progress.

The longest National Highway is NH-7 from Varanasi to Kanyakumari (2344 km).