Obtaining of the One-off Surveying Elements of Highway's Helix Line and Its Sideline

The formulas of independent coordinate of any point on highway's whirly line and its sideline, and the method to translate from the independent to the surveying coordinate are deduced. Finally the whirly line in oval highway is taken as an example and the explanation to a special calcalating example is given. The deduced results have good utiluty walue and guidance to the survey of high-level highway.