Next week the city will begin testing automated garbage collection trucks on a few routes. These trucks require only a driver, as the hydraulic arm lifts the garbage containers and empties them into the truck. Supervisors have been trained in operating the automated trucks and, for the next six months, one supervisor and two sanitation workers will ride in the trucks, so that the supervisors can train the workers. No worker may operate these trucks without three shifts of training. Sanitation workers will be assigned to the trucks on a rotating basis.Which of the following can be inferred from the passage about the automated trucks?