I recently had the dubious pleasure of driving the N1 from Johannesburg to Cape Town, and back; I'm now going over the road in Waze fixing up all the gaps / spurious junctions / incorrect segment directions, and it's proving to be even more boring than the actual driving :/
Anyhow, I've done from Cape Town through to Colesberg so far; I guess if anyone wants to raise any issues with this road, now would be a good time to do it, while I still have the editing privileges.
AM: Johannesburg, South Africa
Community expert: South Africa (client / Android / editing / routing)
Android 4.1 / HTC One X