Popa, they would shovel just enough spots to fit all the cars.
ZD, listen, I really do feel very bad about what happened to you, especially now that you say the effects are still there, but it’s got nothing to do with Shabbos.
1) They should have shoveled before Shabbos
2) If they didn’t, common sense dictates not to walk there. The reason the law is as you stated earlier is because if someone did shovel, it gives the false impression that it’s safe to walk there. If it wasn’t shoveled, the owner is not subject to a lawsuit because it’s the fault of the pedestrian for not avoiding the area.
The property owner is liable for a summons not because he caused a dangerous situation. As you said, that was an act of G-d. He is liable for not providing the public access to passage. That’s very different.