1. A need for status. Driverless cars will first greatly distinguish luxury cars from more ordinary cars.
2. Convenience and comfort. Driverless cars will remove the stress from rush hour commuting. Driverless cars will be much more comfortable for long-distance trips.
3. Safety. Driverless cars will obey the traffic laws. "drivers" and passengers of such cars will much less likely be arrested for driving under the influence of alcohol or drugs.
4. Efficiency. Driverless cars will use less fuel than otherwise comparable self-drive cars. For example, cooperating driverless cars can draft at highway speeds. Additionally, driverless cars can smooth out stop-and-go traffic, coast down hills and otherwise conserve momentum. And once driverless cars are commonplace, intelligent intersections will permit cooperating driverless cars to interleave without stopping - while accommodating self-drive cars with conventional signs and signals.