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According to the Indian road congress the ruling slope of roads (Plain terrain) should not be more than:-
1. 1 in 18
2. 1 in 15
3. 1 in 20
4. 1 in 30

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Correct Answer - Option 4 : 1 in 30

Explanation:

Gradient: Gradient is the rate of rise or falls along the length of the road with respect to horizontal.

Expressed as ‘1' vertical unit to 'N' horizontal units.

Types of Gradient:

i) Ruling gradient: The gradient is fixed in such a way that maximum power developed by the engine is equal to the power required to overcome the resistance to the motion on the grade at design speeds.

ii) Limiting gradient: A gradient steeper than the ruling gradient which may be used in restricted length, where the ruling gradient is not possible.

iii) Exceptional gradient: A gradient steeper than the limiting gradient which may be used in very short stretchers only in an exceptional case.

Terrain

Ruling

Limiting

Exceptional

Plain/Rolling

3.3

5.0

6.7

Hilly

5.0

6.0

7.0

Steep

6.0

7.0

8.0

∴ The value of the ruling gradient in plains as per IRC is 1 in 30 or 3.3%.

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