For the same reason it couldn't reliably navigate multi-lane roundabouts a few years ago. For the same reason it viewed railroad crossings as a weirdly broken

For the same reason it couldn't reliably navigate multi-lane roundabouts a few years ago. For the same reason it viewed railroad crossings as a weirdly broken red traffic light with intermittent trucks. For the same reason it still hits stationary emergency vehicles with lights going. Because the software is nowhere near ready.