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

None of these
parapet wall
retaining wall
breast wall

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

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

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