It's not validation in the conventional sense but there seems to be some sort of system that detects crossing highways I suspect by using overpass. It was developed in Europe for crossing highways there but has now been extended to cover other places and I'm not sure of the name of it.
Anyway rat_run I hope I have the user name right, has been hard at work fixing highways in Africa. I don't think they are a HOT mapper they just clean up the map. I certainly seem to often find they have fixed the map a few hours before I get there using the daily dump loaded into JOSM. So if you are hoping to use OpenStreetMap for routing in Africa it looks as if things are improving. Cheerio John
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