Really Bad but Cheap

Yes, the bus is a min of 1 hr late, normally a lot more. Yes, in the rain it leaks everywhere. Yes, the bus is turned away at the toll plaza for no funds, has to take the alternative route. Yes, the bus runs out of diesel and the driver has no money for more. But plus minus 24 hrs later there is a good chance that you will actually get to jhb from cape town. Just be sure you have plenty of time and are tough, and you'll be okay. And it's maybe R100 cheaper and always has a seat for you.