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
In case of summit curves, the deviation angle will be maximum when

a descending gradient meets with another descending gradient
an ascending gradient meets with another ascending gradient
an ascending gradient meets with a level surface
an ascending gradient meets with a descending gradient

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