How to add point into finished spline road?

Here is a trouble. I have created landscape, done roads with splines, but now i figured out, that i need to add more curves to road, so i want to add spline points into my spline, without creating roads from scratch. I mean, add point between two points. Is there any method to do that?

I believe Alt Draging a pivot should work. I recall doing something similar about a month ago…