Highway Engineering
The walls which are necessary on the hill side of roadway where earth has to be retained from slipping is known as

retaining wall
breast wall
None of these
parapet wall

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Highway Engineering
The entrance and exit curves of a rotary have

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

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