I have been struggling to find out why routing does not work north of 
Bloemfontein. 
http://www.yournavigation.org/?flat=-27.190177&flon=27.498519&tlat=-27.261156&tlon=27.487043&v=motorcar&fast=1&layer=mapnik

Just found the reason: 2 sections of the N1 are mapped highway=motorway. This 
is assumed to be oneway=yes which is incorrect, in this case since it is a 
single way and not double!

I have now changed both to highway=trunk

For the record the offending ways:
http://www.openstreetmap.org/browse/way/4761199
http://www.openstreetmap.org/browse/way/4761204

In the hope that others can learn from my lesson.

John

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