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

satisfactory for road surfacing
unsuitable for road surfacing
exceptionally strong
strong

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

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

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