Generally, the more the merrier.

It’s absolutely crucial that copyrighted data isn’t uploaded to OSM, and if users have been using a GPS receiver with “snap to road” turned on, it’s possible that their data is unwittingly copyrighted. So you might want to add some text explaining that and offer an opt-out for such users. That said, most of your tracks look like they’re in Africa, and IMX most GPSs don’t have many roads marked in Africa!

For road conditions, you’re into full-blown editing - lots more about that on the wiki.

You’ll get some help here but you might get more on the mailing lists.