When it comes to sidewalks, I think drivers are expected to exercise reasonable care that they not hit something/someone when they cross one. I don't think they bear much responsibility to make certain that things on the sidewalk (especially if illegal) don't hit them. If I am "in the driveway" while using the sidewalk I would expect the driver to avoid hitting me. If I hadn't yet entered the driveway I expect I would simply stop whether or not I was a pedestrian or a slow moving cyclist. If I didn't, I assume that I would hit the vehicle, not that the vehicle would hit me.