Highway Engineering
The attainment of super elevation by rotation of pavement about the inner edge of the pavement

results in balancing the earthwork
avoids the drainage problem in flat terrain
does not change the vertical alignment of road
is preferable in steep terrain

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Highway Engineering
A traffic rotary is justified where

space is limited and costly
when traffic volume is more than 5000 vehicles per hour
when traffic volume is less than 500 vehicles per hour
number of intersecting roads is between 4 and 7

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