Self-driving car collaborations are becoming increasingly commonplace. The latest team-up comes from Ford and Walmart -- two older-world companies using autonomous tech to combat nascent startup rivals and remain relevant in an ever-changing landscape. The eventual goal is to bring Walmart shopping items to customers in a self-driving Ford with the help of Postmates' delivery infrastructure. Initially, however, the venture will rely on human-driven cars designed to simulate how a self-driving vehicle would operate. Ford has already started testing its autonomous cars in Miami and Washington DC, with plans for commercial production by 2021.