That is not to say that shifting people from single-occupancy motor vehicles to carpools or transit has no impact. Quite the opposite: If given priority in the system, such as their own dedicated lane, these systems can make far more efficient use of the road, moving higher volumes of people from one place to another in less time than any auto-based system possibly could. They will move more people, more quickly, and generally at lower cost, but they will not reduce congestion.
