Here in the Dayton/Cincinnati metro area, you encounter completely full parking lots; before the shutdown, I hiked a mile of popular trails to get to a more secluded trail, and there were people every 6 to 12 feet, with a few extra feet between groups or families. They’ve closed some trailhead parking lots, and roped off large sections in other lots, to try to reduce crowds. I haven’t hiked in to see if it’s working.