31) What is maximum ruling gradient recommended by IRC for plain or rolling terrian?

32) When the soil is weak the height of embankment usually provided is?

33) Which instrument is used for ground reconnaissance during the road alignment?

34) Which survey the longitudinal and crosssections are taken and benchmark is established

35) what is termed as by raising the outeredge of the road with respect to the inner edge to reduce the tendency of vechicle accident?