Explanation:

Haryana has a total road length of 26,016 km. There are 15 National Highways (NH) with total length of 2,482 km and many State Highways (SH) with total length of 1,801 km. The most remote parts of the state are linked with metalled roads. Grand Trunk Road, commonly abbreviated to GT Road, is one of South Asia's oldest and longest major roads. GT Road is a part of NH-1.NH-10 is the longest national highway on Haryana.
Delhi-Gurgaon Expressway :It is a 28 km long access controlled toll expressway connecting Delhi, the National Capital of India and Gurgaon, an important satellite city of Haryana. The expressway is a part of the Golden Quadrilateral Project, which itself is a part of the National Highway Development Project (NHDP) and emphasises improving road connectivity between four metropolitan cities of India, namely Delhi, Mumbai, Chennai and Kolkata by developing 4-6 lane highways between them. The Rs 10 billion, 47.7 km expressway was inaugurated on 23rd January, 2008. This expressway is a part of NH-8.