Hi, thanks for the response. Let me quote something you wrote in a comment of another changeset of yours: "Given that in these countries National Roads (RN, NR or N, depending on country) are the most important roads, then trunk should be the most apropriate tag for these."

This is an incorrect assumption. In the DRC, if a road is classified as a national road, this does not automatically imply that this road is important. The classification of the road network in the DRC was done in the 1980s, based on maps that might even have been outdated back then already. There are many stretches of national or provincial roads that are completely abandoned and not usable. Their mapping and tagging should occur carefully and individually, with local knowledge or at least highly likely assumptions based on satellite imagery or other information. I would highly discourage mass edits like yours. If you want to change a road's tag, carefully look at each section of this road and verify your assumptions before doing so.