What value does the IRC recommend for ruling gradients in plain terrain______________?
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Answer: D. 1 in 30
Explanation
Standard classifications in specific design tables reference one in thirty as a common benchmark for milder conditions. This gradient provides a gentle slope that allows commercial trucks to maintain speed without excessive gear shifting. Adopting this standard slope ensures balanced earthwork volumes and safe vehicle operation in level terrain. Ruling gradients represent the maximum grade permitted on highway vertical profiles under normal design conditions. Terrain classification dictates gradient limits, with flatter terrain allowing gentler maximum slopes than mountainous areas. Proper vertical design prevents excessive vehicle fuel consumption and maintains high highway capacity standards.
Option A suggests one in twelve, which is an extremely steep gradient reserved for exceptional mountain conditions. Option B proposes one in fifteen, representing a steep grade unsuitable for normal plain terrain alignment. Option C lists one in twenty, which is steeper than the standard ruling gradient typically prescribed for flat areas.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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