It's not hard to imagine at all. Did you watch the embedded video? The pedestrian is almost invisible. On my first viewing I didn't see her at all. On repeat viewing, and with foreknowledge, I could just make out her sneaker by reflected light, and her torso in silhouette. She has no reflective gear on her body or her bicycle, and the street lighting is nonexistent where she chose to cross (between street lights, and not on a marked crosswalk or corner). I'm pretty sure I would have hit this woman under these conditions, as horrifying as that is.