3. State the standard road width for NH, SH, MDR, ODR and VR as per IRC.
Answers
Answer:
ndian roads are under 5 classifications defined by Ministry of Road Transport & Highway
(MoRTH). i) National Highway (NH), ii) State Highway (SH), iii) Major District roads (MDR),
iv) Other District Roads (ODR) and v) Village Roads (VR). Objectives of setting design
standards is to confirm the proposed road with the codes of practice, to gives a clear picture
of how the proposed facility would look like once implemented and also to maintain
uniformity throughout the corridor to achieve the desired purpose of the facility and to ensure
safety and comfort for the road users. Non-uniform or inadequate design standards lead to
confusion for the drivers to adapt to the changing road characteristics and cause accidents.
For the present Project, it is proposed to follow Design standards given in Indian Roads
Congress (IRC), Tender SURE specifications, codes of practice, guidelines and special
publications, as well as applicable MORT&H circulars and reports. Where the said standards
are silent for any particular element of design, other standards like, American Association of
State Highway and Transport Officials (AASHTO) Standards and Any other National or
International Standard as considered suitable shall be referred to and the one considered
the best and relevant adopted:
In India, IRC has recently revised the Engineers Pocketbook for
Highway Construction to include classification and definition of
urban roads. The classification of urban roads is given in
following table 4.1.
Table 4.1 Classification of urban roads
Classification Width
Arterial 50 to 60m
Sub-Arterial 30 to 40m
Collector Street 20 to 30m
Local Street 10 to 20m
Table 4.2 R-o-W allocation for existing roads
Road
Type
R-o-W
(M)
Travel
Lane Footpath Dedicated cycle
lane
Parking
lane
BRTS
Lane
SubLocal
2 2 --- --- --- ---
3 2 1 --- --- ---
References
Tender SURE guidelines
Consultancy Services for preparation Detailed Project Report for Comprehensive
development of selected roads of Bangalore City under Tender SURE guidelines – Package
D, E, F & G
Chapter-4: Design Standards Draft Detailed Project Report
Page 4 - 2
Road
Type
R-o-W
(M)
Travel
Lane Footpath Dedicated cycle
lane
Parking
lane
BRTS
Lane
5 3.5 1.5 --- --- ---
6 3 2+1 --- --- ---
7 4.5 1.5+1.0 --- --- ---
7 3.5 1.5+2.0 --- --- ---
8 5 1.5+1.5 --- --- ---
10 3+3 2+2 --- --- ---
Local
10 2.5+2.5 1.5+1.5 --- 2 ---
12 4+4 2+2 --- --- ---
12 3+3 2+2 --- 2 ---
13 3.5+3.5 2+2 --- 2 ---
13 2.5+2.5 2+2 --- 2+2 ---
15 3.5+3.5 2+2 --- 2+2 ---
15 2.5+2.5 2+2 1+1 2+2 ---
18 3+3 2+2 2+2 2+2 ---
18 5+5 2+2 2+2 --- ---
Collector
21 6+6 2+2 2 2 ---
21 6+6 2+2 2+2 2 (Alt) ---
28 6+6 2.5+2.5 2+2 2+2 ---
30 5.5+5.5 3+3 2+2 --- 3.5+3.5*
Subarterial
33 6.5+6.5 3+3 2+2 --- 3.5+3.5*
34 7+7 3+3 2+2 --- 3.5+3.5*
39 10.5+10.5 2.5+2.5 2+2 ---
Answer:
Below Standard Single Lone: Surfaced roads having clear carriageway width of below 3.75 M. Standard Single Lane: Surfaced roads having clear carriageway width between 3.75 M to below 7.0 M.
In the United States, the Interstate Highway standards for the Interstate Highway System use a 12 ft (3.7 m) standard lane width, while narrower lanes are used on lower classification roads. In Europe, laws and road widths vary by country; the minimum widths of lanes are generally between 2.5 to 3.25 m (98 to 128 in).
Width of a traffic lane depends on the width of the vehicle and the clearance. Side clearance improves operating speed and safety. The maximum permissible width of a vehicle is2.44and the desirable side clearance for single lane traffic is 0.68 m. This require minimum of lane width of 3.75 m for a single lane road
Basic Requirement of an Ideal Alignment
It should have a shortest path. The alignment must be easy to construct and maintain and also it should be easy for vehicle operation. It should be safe in case of designing the horizontal and vertical curves.