Windhoek is largest city and also the capital of Namibia. The city has a population of about 342,141 people. This is the city where most safaris travelling through Namibia begin, and also the first point of entry in Namibia should you arrive by airplane. Most of the roads off the main highways are gravel while the highways are paved. The main means of transport include;

Special hire taxis

Most of the special hires have to be pre-booked via telephone; they’ll come and get you wherever you are. In the city, they can be found behind the Tourist Information Office at the intersection of Independence Avenue and Fidel Castro Street (opposite Gustav Voigts Centre/Kalahari Sands Hotel) and on the northern-side of Wernhill Park shopping mall. They also tend to gather at popular restaurants and nightspots.

Shared taxis

Taxis primarily run between the townships and the main industrial/commercial areas of the city with fixed routes. This gives some added flexibility, but also means that fares between given destinations may not always be the same. To catch a taxi, just flag it down, tell the driver where you want to go before you get in and ask for the fare. Most taxis cruise along Independence Avenue south of the intersection with Fidel Castro Street.

Buses

The city of Windhoek has a municipal bus service with 79 buses for public transport. The buses are usually overcrowded. The buses operate throughout the week in the mornings and afternoons, except on Sundays. To travel using these buses, payments are made through smart card payment at the municipal offices.

References
http://www.citypopulation.de/Namibia.html

http://www.footprinttravelguides.com/africa-middle-east/namibia/essentials/getting-around/