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

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

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Highway Engineering
When the speed of traffic flow becomes zero,then

traffic density becomes zero whereas traffic volume attains maximum value
traffic density and traffic volume both attain maximum value
traffic density attains maximum value whereas traffic volume becomes zero
traffic density and traffic volume both become zero

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Highway Engineering
Centre line markings are used

in roadways meant for two way traffic
to designate proper lateral placement of vehicles before turning to different directions
to designate traffic lanes
to indicate that overtaking is not permitted

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