Ford Motor Company (NYSE: F) said on Monday that it has begun testing an on-demand "self-driving" delivery service in south Florida. Ford has been working with Domino's Pizza (NYSE: DPZ) and Postmates, an urban delivery start-up, to test the potential of deliveries made by self-driving vehicles. Ford and Postmates have enlisted more than 70 local businesses in Miami and Miami Beach to participate in this latest pilot program, in which a vehicle made to look like it's self-driving makes real deliveries to Postmates customers.Thinking that what Miami really needs is an automated taco truck, Ford and Postmates have teamed up to develop a self-driving delivery van.