Hi everyone, this is Andrew from the Apple team. I recently created MapRoulette challenges for the road network in Montenegro, such as looking for overlapping roads, disconnected roads and other similar issues. They are all posted here: https://maproulette.org/browse/projects/39474
If you haven’t used MapRoulette before it’s a tool to go through OSM issues one by one so you can fix them or mark that they aren’t a problem. I plan to fix a few myself, I hope they are useful. Please let me know if there are any questions or suggestions. Thanks!