Highway Engineering
A traffic rotary is justified where

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

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Highway Engineering
The effect of grade on safe overtaking sight distance is

to decrease it on descending grades and to increase it on ascending grades
to increase it on both descending and ascending grades
to decrease it on both descending and ascending grades
to increase it on descending grades and to decrease it on ascending grades

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Highway Engineering
The entrance and exit curves of a rotary have

equal pavement widths but radius is more at entrance curve than at exit curve
equal radii but pavement width is more at entrance than at exit curve
different radii and different widths of pavement
equal radii and equal widths of pavement

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