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

retaining wall
breast wall
parapet wall
None of these

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Highway Engineering
The direct interchange ramp involves

diverging to the right side and merging from left
diverging to the left side and merging from right
diverging to the right side and merging from right
diverging to the left side and merging from left

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