Thank for you the quick response! I think your approach to changing highways in East Africa back to primary is a good one. I appreciate your input on RN6 in Congo. Since that road serves as the shortest route between those two major cities, I can see the justification to leave it classified as trunk. I also agree with your last point that highway function and importance should be the main factor when determining these classifications since the surface and condition of these roads can vary widely. I believe that this will lead to a good hierarchy of highway classification in these countries.

Thank you again for taking the time to discuss this. Happy mapping!