For tunnels exceeding 300 m in length, the grade should be provided be – McqOptions

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1.	For tunnels exceeding 300 m in length, the grade should be provided below
A.	50% of the ruling gradient
B.	60% of the ruling gradient
C.	75% of the ruling gradient
D.	80% of the ruling gradient.
Answer» D. 80% of the ruling gradient.

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