Investigation on the design method of the line-shape of border line of a road

Through the analysis of the actions and characteristics of border line of a road, This paper brought forward a question that the law, of the line-shape of border line of a road, requires giving in a definite form, and gave the methods which can be used to ascertain the parameter and to design the line-shape of border line of a road, based on the relation between centric-line and border line.