Highway Engineering
If aggregate impact value is 20 to 30 percent, then it is classified as

unsuitable for road surfacing
exceptionally strong
satisfactory for road surfacing
strong

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Highway Engineering
The entrance and exit curves of a rotary have

equal radii and equal widths of pavement
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

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