Highway Engineering
For design, that length of transition curve should be taken which is

based on allowable rate of change of centrifugal acceleration
smaller of (A) and (B)
higher of (A) and (B)
based on rate of change of super elevation

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Highway Engineering
The direct interchange ramp involves

diverging to the right side and merging from right
diverging to the right side and merging from left
diverging to the left side and merging from right
diverging to the left side and merging from left

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