2getthere’s Masdar City PRT system currently operates with a 5 second minimum headway. Note though that the minimum headway is not the same as the average headway, as it can’t be guaranteed that there is a vehicle every slot; this depends on the arrival pattern of passengers at stations. Once the average headway requirement becomes too low, it makes sense to use larger vehicles. For a system applying GRT vehicles, this means an average headway of 15 seconds is realistic: resulting in a capacity exceeding 5,000 people per hour per direction.
With a need for increased capacity, accommodating crush loads or an increased interval (e.g. for at grade intersections), platooning is an option. In a platoon multiple vehicles are linked virtually, operating as a train. 2getthere has implemented platooning, using the patented synchronized movement of multiple vehicles. Currently 2getthere is contributing to the i-CAVE (integrated Cooperative Automated Vehicles) research program, with the focus on vehicles accelerating and braking simultaneously and being able to enter and leave the platoon on the fly.
As an alternative to platooning, the capacity of the system can already be increased through a smart line configuration. Instead of running all the vehicles for the length of the line, different lines can be designed based on the origin-to-destination matrix. Allowing vehicles to by-pass stations that are not main attractors, or turning back more quickly, maximizes the capacity per hour that can be achieved by a fleet of vehicles. 2getthere has realized capacity increases of >20% implementing express connections between main attractors of the network.