Discussion
The minimum length of Transition Curves as per Indian Road Congress for plain terrain is:
(Symbols have their usual meaning)
Answer: C
The IRC minimum length for plain terrain is \(2.7\ V^{2}/R\).
IRC gives the minimum length of a transition curve from the empirical formula:
\[ L_s = \frac{2.7\,V^{2}}{R} \]
for plain and rolling terrain (and \(V^{2}/R\) for mountainous terrain), with V in km/h and R in metres; the design length is the larger of this and the lengths from the rate of change of centrifugal acceleration and the rate of introducing superelevation. \(0.0215\ V^{3}/CR\) is the centrifugal acceleration criterion, not the plain-terrain minimum, and the other two options are not IRC formulae.
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