The cross drainage structure of a highway is considered in which aspect?

The pressing problems on the existing highway are ______

The trees in urban areas are provided for ______

The studies prepared for environmental studies are called ______

What is the desirable distance for a tree from the carriage way?

The compensation for loss of land in agricultural areas should be paid ______

The number of trees required for 1 km of length in nursery are ______

The point that should not be considered for a better highway is?