I can’t see because the lot’s surface is enough above the sidewalk, but my theory is that the people in the house to the right bought the lot to the left and had the house that was there removed. Gone. And my theory is they had a pool installed (lot now completely fenced), although I can’t see it. I will listen for water noises when it gets warmer out. Anyway, more hypothesizing: this apparent driveway is not for daily use.