21.When the bituminous surfacing is done on already existing black top road or over existing cement concrete road, the type of treatment to be given is

22.The camber for hill roads in case of bituminous surfacing is adopted as

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

24.Select the correct statement.

25.The most suitable equipment for compacting clayey soils is a