Discussion
At sharp horizontal curves on highways radius 'R' (in meters), the percentage reduction in gradient, provided to compensate the loss of traction force due to curvature is:
Answer: B
The maximum grade compensation is 75/R per cent.
On a horizontal curve, extra tractive effort is needed to overcome curve resistance, so IRC requires the gradient to be eased. The grade compensation is (30 + R)/R per cent, subject to a maximum of 75/R per cent, where R is the radius in metres. Compensation is not needed for gradients flatter than 4 per cent.
50/R, 100/R and 125/R are not the IRC limit.
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