It would make sense as a path to consumer adoption (Wired):
Autonomous driving is nothing new for trucks in agricultural and military applications, and should be available for passenger cars by 2020. But trucks that share our highways are tempting candidates for shedding their human component: Highway driving is easy for computers but dangerous for us, especially when big machines are involved. In 2012, according to NHTSA, 333,000 large trucks were in crashes in the US. Those accidents killed nearly 4,000 people, the vast majority of whom were riding in passenger vehicles. Regulators have trouble ensuring that drivers get adequate rest, and the trucking industry has fought back against regulation.
With the idea that humans who drive less cause less trouble, Mercedes equipped the Future Truck 2025 with the “Highway Pilot” automated system. “It never gets tired. It’s always 100 percent and sharp. It’s never angry; it’s never distracted,” says Dr. Wolfgang Bernhard, the Daimler board member for trucks and buses. “So this is a much safer system.”