Assertion: IRC has recommended spiral Transition curve in the horizontal alignment of the highways.
Reason: It can be set out easily compared to cubic parabola and leminscate.
The Indian Roads Congress (IRC) strictly recommends the spiral (or clothoid) as the ideal
transition curve for the horizontal alignment of highways.
This is because its radius decreases linearly as the curve length increases (LR constant),
which keeps the rate of change of centrifugal acceleration completely constant.
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