Which Highway is known as World’s Longest National Highway?

Highway 1 of Australia Highway 1 of Australia was established in 1955 with a length of 14,500 km is the World’s Longest National Highway. The Highway runs through all states and their capitals of Australia.  

Which is the smallest national highway in India?

Currently, National Highway 548 and National Highway 118 are India’s shortest highways.  NH 548 is just a 5 kilometer long highway in Maharashtra and connects Kalamboli with NH348.  NH 118 is also a 5 kilometer highway connecting Asanbani and Jamshedpur in the state of Jharkhand.