KIM HARRISBERG  LONG queues in the rain, daily four-hour trips in a public taxi, the constant threat of road accidents, and nearly having to use a pen as a knife to fight off an aggressive male passenger. These are just some of the challenges Busisiwe Nongauza has faced while commuting to and from her job as an insurance underwriter in Johannesburg, South Africa's biggest city. Nongauza, who lives in Soweto, the country's biggest township, is not alone in her experience. A new study shows that in Sub-Saharan Africa "transport poverty" - when inaccessible or unsuitable transport negatively impacts a person's…