Nepal Road standard 2070 has classified road as
A. Administrative classification
i) National highways – National highways are main road, mainly connecting east to west and north to south border of country. These roads are designated by H followed by two digits number. These types of road serve directly greater portion of long distance travel.
ii) Feeder roads – These roads are designated by F followed by 3 digits number. These roads connect district headquarter, major economic center and tourism center to national highway.
iii) District roads – These roads connect the production center and market within the district and connects with main highways.
iv) Urban roads – Urban roads are road serving with in municipality.
B. Technical classification
i) Class I – It has Annual Daily Traffic (ADT) is more than 20000 PCU with design speed of 120 km/hr in express ways.
ii) Class II – It has ADT (5000-20000) PCU in 20 years perspective period. Design speed is 100 km/hr in arterial roads.
iii) Class III – It has ADT (2000-5000) PCU in 20 years perspective period. Design speed is 80 km/hr in collector roads.
iv) Class IV – It has ADT less than 2000. Design speed is 60 km/hr in local roads.
| Plain & rolling terrain | Mountainous & steep road | |
| National Highways | Class I, Class II | Class II, Class III |
| Feeder Roads | Class II, Class III | Class III, Class IV |
# Classification of Terrains
a) Plain Terrain
The area of country having cross slope varying from 0% to 10% is known as plan terrain.
b) Rolling Terrain
The area of country having cross slope varying from 10% to 25% is known as rolling terrain.
c) Mountainous Terrain
The area of country having slope varying from 25% to 60% is known as mountainous terrain.
d) Steep Terrain
The area of country having a cross slope greater than 60% is called steep terrain.
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