I joined this site due to cycling. My tracking app (Strava) uses Open Street Maps. One of my cycling goals was to ride every street in my city, which is difficult enough without mapping errors. I kept seeing “roads” on this map that are in reality private driveways, “public” roads that are actually private, and some roads that exist in reality but aren’t on the map yet. (And in one case, a road on the map that has never existed in reality.)
I haven’t yet figured out how to accurately add missing roads, but I’m trying to make the map better by correcting these other features.