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Handbook on highway design, right of way requirements, design speed, volume etc, hierarchy of roads
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1. GEOMETRIC DESIGN STANDARDS FOR NON-URBAN HIGHWAYS (IRC: 73-1980)
Non-urban roads in India are classified into following five categories based on location and
function according to Nagpur road plan:
National Highways (NH) State Highways (SH) Major District Roads (MDR) Other District Roads (ODR) Village Roads (VR)
Present system follows modified classification system as per third 20-year road
development plan. The roads are now classified into following three classes, for the
purpose of transport planning, functional identification, earmarking administrative
jurisdictions and assigning priorities on a road network:
Primary system o Expressways and National Highways (NH) Secondary system o State Highways (SH) and Major District Roads (MDR) Tertiary system (Rural Roads) o Other District Roads (ODR) and Village Roads (VR)
Table 1.1 Classification of terrains Terrain Classification Cross slope of the country (%) Plain 0 – 10 Rolling 10 – 25 Mountainous 25 – 60 Steep > 60
Table 1.2 Design Speeds on Non-urban Roads
Road Classification
Design Speed (km/h) Plain Rolling Mountainous Steep Ruling Min Ruling Min Ruling Min Ruling Min Expressways 120 100 100 80 80 60 80 60 NH and SH 100 80 80 65 50 40 40 30 MDR 80 65 65 50 40 30 30 20 ODR 65 50 50 40 30 25 25 20 VR 50 40 40 35 25 20 25 20
Table 1.3 Recommended values of camber for different types of road surfaces Sl No Types of Road Surface Range of Camber in areas of Heavy rainfall Light rainfall 1 Cement concrete and high type bituminous surface 1 in 50 (2.0%) 1 in 60 (1.7%) 2 Thin bituminous surface 1 in 40 (2.5%) 1 in 50 (2.0%) 3 Water bound macadam and gravel pavement 1 in 33 (3.0%) 1 in 40 (2.5%) 4 Earth Road 1 in 25 (4.0%) 1 in 33 (3.0%)
Table 1.4 Recommended values for width of carriageway Sl No Class of Road^ Width of Carriageway (m) 1 Single lane 3. 2 Two lanes, without raised kerbs 7. 3 Two lanes, with raised kerbs 7. 4 Intermediate carriageway (except on important roads) 5. 5 Multi-lane pavements 3.5 m per lane Notes: The lane width of Expressways is 3.75 m in plain and rolling terrains and 3.5 m in mountainous terrian The width of single lane for village roads may be decreased to 3.0 m On urban roads without kerbs the single lane width may be decreased to 3.5 m and in access roads to residential areas to 3.0 m The minimum width recommended for kerbed urban road is 5.5 m
Table 1.5 Recommended values for width of roadway of various classes of roads
Sl No Road Classification
Roadway width (m) Plain & Rolling terrain
Mountainous & Steep terrain
1
National & State Highways a. Single Lane b. Two Lane
Major District Roads a. Single Lane b. Two Lane
Other District Roads a. Single Lane b. Two Lane
4 Village Roads – single lane 7.5 4.