Time is a limited and valuable resource. As much as possible, people should spend the precious hours of their lives in the most satisfying and productive possible ways. This has important implications for transportation planning, since most people spend a significant amount of time in transport, and travel time savings are often the greatest projected benefits of transport projects such as roadway and transit service improvements.
You really need to almost get hit by a car to feel like a true Johannesburg pedestrian. That's the way it goes here. A huge, sprawling greater metropolitan area of about 10 million people covering more than 600 square miles, the city is built for the car. And if you're not in one, good luck.