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
Length of a vehicle affects

extra width of pavement and minimum turning radius
width of traffic lanes
width of shoulders and parking facilities
clearance to be provided under structures such as overbridges, under-bridges etc.

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