 Driving: Bob lives in a large city in the developed world. His daily life is greatly enhanced by the fact that he and others are able to drive cars. Bob drives to work, drives out of town for the weekend, drives to the local shopping mall, enjoys goods and services that are only available because others can drive, and so on. One morning, while walking his dog along the street, Bob is killed in a traffic accident. The driver was not at fault – she was not speeding or drunk or otherwise irresponsible. Bob is just unlucky. In a large city where millions of people drive every day, faultless fatal accidents like this are bound to happen from time to time.