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
retaining wall
parapet wall
breast wall

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Highway Engineering
For a constant value of coefficient of lateral friction, the value of required super-elevation increases with

decrease in both speed and radius of curve
increase in both speed and radius of curve
decrease in speed and with increase in radius of curve
increase in speed and with decrease in radius of curve

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