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Design speed of National Highway and state highway roads for plain terrain is тАжтАжтАжтАж
40 to 50 kmph
80 to 100 kmph
30 to 65 kmph
65 to 85 kmph
80 to 100 kmph
According to the Indian Roads Congress (IRC) standards, the design speed for National Highways (NH) and State Highways (SH) in plain terrain is recommended to be in the range of 80 to 100 kmph. This range ensures a balance between mobility, safety, and the physical constraints of the topography.
According to the Indian Roads Congress (IRC) standards, the design speed for National Highways (NH) and State Highways (SH) in plain terrain is recommended to be in the range of 80 to 100 kmph. This range ensures a balance between mobility, safety, and the physical constraints of the topography.
VdтАЛ=f(Terrain,Classification) тАФ Design speed is a function of terrain category and road classification per IRC:73.
Design speed is a fundamental parameter in highway geometric design, derived from terrain classification and road functional importance. In plain terrain, which offers lower gradients and better sight distances, higher speeds are permitted to enhance travel efficiency. The geometric elements like curve radii, super-elevation, and sight distances are calculated based on these design speed values.
Design speed determines the basic geometry of the road including horizontal and vertical alignment.
Plain terrain allows for higher design speeds compared to rolling, mountainous, or steep terrain.
IRC:73 (Geometric Design Standards for Rural Highways) is the primary code for these specifications.
Reduces travel time and fuel consumption.
Standardized design promotes driver predictability and safety.
Higher speeds require larger radius curves, increasing land acquisition costs.
Increased kinetic energy in vehicles leads to higher crash severity.
Highway infrastructure planning.
Traffic safety audits.
Geometric design of road intersections and curves.
For rolling terrain, the design speed for NH/SH is typically 65 to 80 kmph.
For mountainous terrain, the speed drops further to 30 to 50 kmph based on the steepness.
Design speed is the maximum speed at which a vehicle can be maintained safely on a highway section under favorable conditions.
B is correct тАФ The design speed for National and State Highways in plain terrain is established by IRC guidelines to be between 80 and 100 kmph.
Remember that design speed is inversely proportional to the steepness of the terrain; always check the terrain type (plain, rolling, mountainous) before selecting the speed range in highway design questions.