Highways

• Highway tags are correct? Some mappers tag every highway as a track because they are not paved, but this is not a meaningful criteria in some developing countries considering the amount of unpaved roads. Check the wiki definitions, perhaps the Highway_Tag_Africa is relevant & you should research there before going any further. Road geometry.
• Road Geometry Some mappers do not put enough details and others too much (eg a node every 10 or 20 m even if the road is straight). Delete extra nodes if they actually make a straight road weave.