When Curve-Curve - Reverse Curve is selected as the Transition Type, this option lets you specify the radius for the first and second curves used in the widening.
public PropertyDouble RadiusOfReverseCurve { get; }
Public ReadOnly Property RadiusOfReverseCurve As PropertyDouble Get
public:
property PropertyDouble^ RadiusOfReverseCurve {
PropertyDouble^ get ();
}