Somehow I expect that this unfortunate lady got in front of the sweeper, without the sweeper operator seeing her approach.
Heavy equipment presents the operator with huge blind spots that a lot of the time is by the very nature of the equipment, almost impossible to design the risk out.
I get training on this as part of health and safety job site training every year.
Last time around you could virtually drive a bulldozer ( because a few key strokes can control it.)
Simulation had a split screen to show a view of the bulldozer, and the view from the cab. There were huge areas you could not see.
Goal was to establish eye contact and communicate clearly with those who had a need to traverse the area where you were working.
In one spot due to blade arm location I could not see from cab view a pickup truck until the last moment.
A pickup is gobs larger than a pedestrian