It would be helpful if he could speak to what kind of efficiency he is talking about. In the simplest terms it is what people prefer. Begin with the heart of the system - automatic control. Recent studies of French systems show that even with large vehicle systems automation improves the economics. One of the primary reasons is that vehicles can be deployed to when and where the demand is located.
Scheduling is improved.
Vehicle dispatch is not dependent on driver work rules. Labor savings are obvious. Safety is better also. Automation improves the economics for large vehicle systems. PRT can take even more advantage of automation.