[ORD R4] Parabola Sight Distance

Hi,

does anyone know how ORD calculates Parabola's Sight Distance?. It's one of the fields which we can annotate on profile curves but it looks like it doesn't do it as in earlier versions (SS4 and below). Can we set some parameters for this like eye and object height? I don't think that assigning standards for alignment work with this.

Regards

Krzysztof Jędrych