except that the really useful routes are already national roads and getting pass down to provinces is unlikely but yes it would be perfectly sensible for provinces to establish their own Surface Transport Utilities companies and use either fuel levies or empower collection. The Western Cape and Gauteng are well served by fuel levy on fuel sold in the province the Free State would do better on tolls. Of course if the WC does impose a fuel levy people will buy fuel in a neighboring province if convenient and you might run into the economic detriment argument.
I really don't believe people in Cape Town will drive all the way to the eastern cape to save a couple of rands (Some trucking companies might, but I doubt most people would).
And it would be *very* difficult to prove economic detriment to other provinces.
So there is hope that the WC Gov builds the own big highways and doesn't rely on SANRAL