I have recently come across vector road data from the Africa Infrastructure Knowledge Program (http://www.infrastructureafrica.org/documents/list/roads). I found these data helpful for three reasons:
- They are freely available
- They cover most sub-saharan countries
- Information on road surface (e.g. paved/unpaved, asphalt/gravel/earth) is available for all surveyed countries
Do these data have serious limitations, I should be aware of?
And if yes, could you recommend better data, which allow a comprehensive assessment of paved roads in Africa?