为了应用，笔者编制了六次代数式缓和曲线系数表，并着重阐述了它在回头曲线中的应用。
For the purpose of application, the author tabulates the coefficient tables of transition curve of 6th power function and describes emphatically its application to switch-back curves.
介绍回头曲线采用圆曲线时，其半径以任意值和指定值的测量放样，以达到灵活应用的目的。
This paper introduces the measuring sample layout of the back curve, when the back curve is round, the radius can be any value or given value for realizing its flexibility of application.
介绍回头曲线采用圆曲线时，其半径以任意值和指定值的测量放样，以达到灵活应用的目的。
This paper introduces the measuring sample layout of the back curve, when the back curve is round, the radius can be any value or given value for realizing its flexibility of application.
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