Indeed, some years ago my firm (medical publishing) went to Johannesburg for the World Aids Conference.
One of my friends went on safari and had to hire a car and drive all the way to where the big game park was. When I asked how people get around there generally he said that they'd attempted to set up a public transport bus system, but it only lasted a short while as many of the bus drivers were shot dead.
Apparently they been taking trade away from the private combi vans...