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

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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