A1/A2:OSM + Bing + GM + Jawg + Thunderforest indicate A2 being A1. OSM + Bing + Jawg + Thunderforest call the eastern
A1 segment A2. GM has no name for the latter.
GSV is older (<=2016) than the motorways have been opened but numbering is confirmed by
a recent SSC post.
wegenwiki seems to be outdated.
It seems that A1 is signed at
exits where GSV is available, you might search for videos if you need more evidence.
N1:wegenwiki reports "The N1 in Dakar has partly been replaced by the A1 autoroute." I'd truncate N1 at west end if there is no good reason to keep it on concurrency to A1. If GM is the source, the route should be extended to Dakar Plateau.
N2b:Does it exist? Only Esri has it. GM vanilla N2, OSM no numbering.
Bing N1 
N2c:Does it exist? Only Esri has it but a vanilla N2. GM, OSM and Bing etc have no numbering.
wegenwiki nor
wikipedia have N2b nor N2c. I think wikisara has no article about Sénégal.
N4Big:Needs a wp just south of the border, the segment is too long if one has not crossed the border
N7:X407644 looks hidden. Do we need a visible wp here?
X429089 looks hidden. GM indicates Bohé Balédié.
I'll continue the review when the remarks have been checked.
