I live in West Africa for some years now.
Don't bother about perfect road classification, as it does not match our experience of roads anyhow.
A jungle road with some gravel is often seen as a “highway” by everyone. The condition varies extremely and a road can become unpassable in the rain season or for other reasons. Routing is the smallest problem and the data does not replace the need to ask locals about the road condition. Cars can always pass each other, even on a food path. My Defender can go through everything! The problem starts if some trucks get stuck in the mud.
A local scene is developing slowly, but the people often have different problems. In Ghana we have e.g. in the moment 24h no electricity and then 12h electricity.