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

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

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Highway Engineering
With increase in speed of the traffic stream, the maximum capacity of the lane

first decreases and then increases after reaching a minimum value at optimum speed
decreases
increases
first increases and then decreases after reaching a maximum value at optimum speed

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