Indeed. Beyond that, it's also entirely possible there's someone -- a pedestrian on the sidewalk ahead, a driver about to exit their driveway... -- that you don

Indeed. Beyond that, it's also entirely possible there's someone -- a pedestrian on the sidewalk ahead, a driver about to exit their driveway... -- that you don't see but who is interested in what you're planning to do. (This happens to me commonly as a pedestrian.)