Thanks, yes I have figured that so far. I think what has confused me, is that when people say edges in connection with roads and streets, they mean the actual edges of the roads and the streets. But in this case, it is just edge like in geometry. So if I am understanding correctly now, the edge will actually be the centreline of the road, going from the first item in the edgelist to the next?
What pains me in trying this out is that, while empirically testing this, very often you get error like "too much curvature" or similar, but I am thinking they should work something like Bézier curves. I wish Urban games made a visual explanation.