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

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

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Highway Engineering
In case of summit curves, the deviation angle will be maximum when

an ascending gradient meets with another ascending gradient
an ascending gradient meets with a descending gradient
a descending gradient meets with another descending gradient
an ascending gradient meets with a level surface

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