According to the Advanced Transit Association, a PRT system has:
Personal automated transport (PAT) is a newer term which is intended to be somewhat broader than PRT and may include dualmode as well as PRT. Kirston Henderson of MegaRail was one of the first to use the term. "Transit" means only "mass transit" with large vehicles to most people. "Rapid" is seriously ambiguous - how fast is rapid? PAT implies a computer-controlled system which can operate economically while carrying one person per vehicle. Small elevators (lifts) could be considered to be PAT, although we don't know if anyone is using PAT to include elevators.
Since the Higherway system is in the preliminary design and analysis stage there are no firm specifications yet. However, the following table gives some numbers which can be considered to be requirements, goals, and estimates. Most of these have been published in the ATRA report, "Personal Automated Transportation: Status and Potential of Personal Rapid Transit".
|Acceleration & Through Tracks||1.0 meter||0.44 meter||22 meter sections|
|Ramp Tracks||0.65 meter||0.44 meter||up to 22 m sections|
|Minimum Curve Radius||5.5 meters|
(looking up at 45 degrees)
|2 m for two tracks|
|Vehicle||Height||Width||Length||Gross Vehicle Mass||Empty Vehicle Mass|
|Dove||1.8 m||0.8 m||4.5 m||400 kg||200 kg|
|Baz||0.7 m||0.38 m||4.5 m||900 kg||100 kg|
|Pelican||1.7 m||1 m||4 m||800 kg||400 kg|
|Owl||1.9 m||1.2 m||4.5 m||800 kg||300 kg|
|Pheasant||1.3 to 1.5 m||1.2 m||4 m||800 kg||570 kg|
|Quail||1.2 to 1.5 m||1.2 m (guideway)
1.8 m (street)
|4 m||750 kg||600 kg|
Guideway 600 - 750 VDC with 360 Hz AC ripple, unregulated
Vehicles - Two permanent magnet brushless DC motorwheels, rated 25 kW each for Dove, 50 kW each for Baz. Estimated power consumption on level track at 45 m/s is 5 kW for the Dove, 10 kW for the Baz when carrying a Pelican. The motor controllers operate on the unregulated DC power from the guideway. The Dove and Baz motorwheels are the same size, but the Baz achieves a higher power rating with more liquid cooling. Depending on application and location the Dove motorwheels may be air cooled or liquid cooled. Air conditioning, heating, and compressed air supply motors may also use unregulated DC power. Everything else - electronics, motors for idler wheels, guidewheels and stabilizer wheels will be operated from batteries charged by power supplies from the AC ripple.
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This page last updated June 1, 2003