It's also possibly not possible? I used to have a neighbor who used the road. I don't know that they really had any other choice. There were plenty of people on the block who also knew they had a neighbor who used a wheelchair, but that didn't prevent them from blocking the sidewalk with their cars, or setting up their lawn sprinklers to ensure that the sidewalk was really well watered, or allowing their bushes to grow across the sidewalk, or leaving their sidewalks unshoveled for days on end.
Government can do a lot of things, but I don't think it can force people to be conscientious.
Right. But that’s a problem that can be solved by law and enforcement. It’s not a law of nature. Just fine people who leave their cars where they don’t belong and otherwise obstruct public ways. That’s what I meant by “making them useable for wheelchairs”.
It also has the benefit of making them more useable for other people.
Those fines would need to be ruinous to justify the cost of collecting them, and you would still have people needing to block walkways for e.g. construction work.
Government can do a lot of things, but I don't think it can force people to be conscientious.