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

strong
satisfactory for road surfacing
exceptionally strong
unsuitable for road surfacing

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Highway Engineering
The sequence of four stages of survey in a highway alignment is

preliminary survey, map study, reconnaissance and detailed survey
map study, reconnaissance, preliminary survey and detailed survey
map study, preliminary survey, reconnaissance and detailed survey
reconnaissance, map study, preliminary survey and detailed survey

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