About tagging of highways
Please read and follow the tagging rules on this linked document.
Decision tree, which tag to be used for roads
https://drive.google.com/file/d/1S48CEVi3yiAYWhIJu57jtLyv0ZVUbGwJ/view?usp=share_link
https://wiki.openstreetmap.org/wiki/East_Africa_Tagging_Guidelines
or
https://wiki.openstreetmap.org/wiki/Highway_Tag_Africa