We do, they just don't use them. They want to be
in the road with everyone else
Please point out to me these wonderful roads you speak of in Pretoria that have dedicated cycle lanes; I've lived there over 30 years and haven't come across them.
I think most of you are full of nonsense ... if you ride into a cyclist from behind, it IS your fault and it makes you a lousy driver (I mean, this was a RACE for Pete's sake, and a policeman) --- if you can ride into a cyclist from behind, it really does mean that your attention is poor enough that you will ride into ANYTHING in front of you, including other cars that e.g. stop rapidly -- you clearly misunderstand the entire "driving" thing if you think that you can drive as fast as you want and everyone must get out of your way. Cars really do not have automatic right of way over cyclists in South Africa (especially as we have no cycling lane infrastructure to speak of), you need to learn the rules of the roads you are driving on.
Cyclists should generally stay in single file, sure, but I honestly virtually never come across cyclists who get in my way while driving, they always keep out the way.