This is Andrew from Apple. I wanted to let everyone know that we just updated the MapRoulette challenges related to road network issues in South Africa with new OSM data.
You can find all of the challenges in this MapRoulette project: https://maproulette.org/browse/projects/39168 and they include things like overly sharp road angles, roads that cross but aren’t connected, roads that aren’t connected to anything, overlapping roads, turn restrictions, roads that are close but not connected to others, and other similar issues. I plan to work on some of them myself too.
If you haven’t used it before, MapRoulette lets you go through potential issues in OSM data one by one and either correct them or indicate they are not a problem. The challenges were created with our Atlas data analysis tool: https://github.com/osmlab/atlas.
If you aren’t sure what challenge to try, sharp angles or crossing roads are probably the easiest but they should all be fairly straightforward.
And if you’re interested in other countries, the full list is here: https://github.com/osmlab/appledata/wiki/MapRoulette-Challenges
Please let me know if you have any suggestions or feedback. Thank you!