# On the Recommendations of Indian Road Congress, the Ruling Gradient in Plains, is

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Updated on: September 25th, 2023

On the recommendations of Indian Road Congress, the ruling gradient in plains, is

1. 1 in 15
2. 1 in 20
3. 1 in 30
4. 1 in 45

Answer: C. 1 in 30

## On the recommendations of Indian Road Congress, the ruling gradient in plains, is 1 in 30.

Solution

Ruling/Design Gradient: It is the maximum gradient, by which roads are designed.

Limiting Gradient: It is steeper than Design Gradient. This gradient is used when construction cost is high.

Exceptional gradient: It is steeper among all the gradients. This is generally used where any steepy obstruction of length less than 100 m arises.

Gradients for different types of terrain are represented as follows.

 Terrain Ruling Gradient (in %) Limiting Gradient (in %) Exceptional gradient (in %) Plain and Rolling 3.3 5 6.7 Mountainous or hilly ( Elevation > 3000m ) 5 6 7 Steepy ( Elevation > 3000m ) 6 7 8

Ruling gradient in plains: 3.3 % or 1 in 30.

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