Public transportation in South Africa isn't very trustworthy and has restricted coverage of the town. If you're heading for Namibia, the most economical and reliable form of transportation is car hire in and the rest of South Africa.
Roads are world-class and you'll not have any trouble reaching your destinations at a normal car unless 4×4'ing is in your itinerary. You can hire 4×4 self drive car rental in Namibia through online resources.
Petrol stations are widely available and are not self-service, it is courteous to tip the attendants as they will fill you up, check your oil and water and clean your windscreen. A tip between R2 and R5 is generally acceptable.
Namibia is home to the endangered Western Leopard Toad, takes care when driving at night during the rainy season as they are often found crossing roads heading to their breeding grounds.
You can check with your travel agent or hotel for advice on which areas to avoid. Locking your car and keeping valuables out of sight will keep you safe on your travels and sticking to the speed limit will keep you on the right side of the law as law enforcement has a no-nonsense policy against traffic offenses. Namibia is a beautiful city with lots to see and do and a visit to this part of Africa should not be missed.