In the automatic mode, the vehicle would be powered elec- trically from an external source. While in the manual or street mode, propulsion might be initially from a turbo-electric power- plant. Eventually, an all-electric propulsion system could achieve minimum levels of noise and air pollution.
Because of the relatively long headways between vehicles, the controls for intervehicle spacing, speed, switching, and stops are not as complex as those required by the personal rapid transit or small dual mode vehicle systems. Nevertheless, the controls will constitute a major portion of the research and development effort leading to a demonstration of the automated dual mode bus system. Significant efforts will also be required for the design and development of the guideway propulsion system and mainline stops for passenger entry and exit while the vehicles are operated automatically. The redistribution and effective use of vehicles and drivers during off-peak and mamial operating periods will require careful analysis. Consideration has been given to the possible use of some of these vehicles as a Dial-a-Bus during off-peak hours.
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Design of the automated dual mode bus would give particular attention to passenger comfort on the longer express trips.
The automated dual mode bus could be developed and its feasibility demonstrated very likely within 5 years at a possible cost of less than $15 million.
5. PALLET OR FERRY SYSTEMS
The most rapid population and employment growth in Ameri- can cities today is in the suburban areas. As a result, the percentage of trips having an origin or destination in a con- centrated central city area is shrinking, and the number of trips between low density residential areas and decentralized indus- trial and commercial areas is growing. To accommodate this growth pattern and to provide other options of urban develop-70
