[2] SSRN 2004 published by the Department of roads in 2004 shows 12 National Highways and 51 Feeder roads in Nepal.
[3] The SSRN 2017/18 shows that the number of national highways in the country has increased to 18 but the number of feeder roads has decreased.
3 more Highways added to National Highway later and more feeder road decreased.
There were only 21 National Highways in Nepal before 2021.
[4] Nepal's road network includes several major highways that are crucial for national connectivity.