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Question
The length of the horizontal transition curve based on the allowable rate change of centrifugal acceleration is 48 m, and based on the rate of introduction of super- elevation is 40 m, and based on the empirical formula, recommended by IRC is 45 m. What will be the shift in the transition curve? Take the radius of the curve as 200 m.
A.
0.33 m
B.
3.68 m
C.
0.42 m
D.
0.48 m
Answer ( Option D)

0.48 m

Solution

As we know that,
Where, R = Radius of transition curve = 200 m
& L = Length of the horizontal transition curve which is based on: 
• The allowable rate of change of centrifugal acceleration i.e. 48 m 
• The rate of introduction of super-elevation i.e. 40 m
• The empirical formula, recommended by IRC i.e. 45 m
Length of transition curve is the maximum of above three criteria i.e. L = 48m

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