Innovations in Urban Public Transportation
Numerous proposals have been put forward for new approaches to public transportation. These range from entirely new systems to large or small changes in existing ones.
Possibly the most imaginative proposal is for an underground system which combines gravity and vacuums for propulsion.8' Another all-new system is called “personalized rapid transit” (PRT) or “rental personalized auto mobile service" (PAS). It would employ small cars for individual movements in urban areas.
These might travel on guide ways and provide station-to-station service. In a dense down town, several adjacent loops could cover the entire area. Another extension of the concept would be dual-mode: cars would travel on a guide way on the portion of their routes common to many other vehicles but run on the streets under their own power on the low-volume portion of their travel, such as from terminal to home. Even yet another approach is to store vehicles at closely spaced convenient locations ready for authorized drivers to use. They would drive over the streets and leave the vehicles at stations near their destinations.
An arrangement to shuttle unused vehicles to points where high demand is predicted would be necessary. As with all entirely new schemes, these would require a substantial initial investment and a long phase-in period.8-1 None have been implemented.
Innovations are also possible in other dual-mode schemes. For example, pallet approaches, such as are provided for auto mobiles on certain rail roads, would have special heavy-rail cars travelling the main arteries carrying the small cars used at the origin and destination ends.
A modest variant sometimes now employed has storage for bicycles on trains or buses, so that they are available at both ends of trips.83
A less elaborate and cheaper system involves slow-moving passenger vehicles that follow a buried cable along a fixed route. They would share walkways with pedestrians or streets with slow-moving vehicles. Numerous similar installations for transporting materials in factories have already been made.
Title Post: Innovations in Urban Public Transportation
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