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Small packets stream resource to need more
effectively than large batches.
In nature delivery systems are streaming.
Blood operates with small vehicles delivering needs on-demand and
streaming away waste products as they are produced. If your red cells
had a thousand times their capacity but were twice as large, you would
be dead.
Size must be tailored to need.
Historically the right size packet for move
people is feet, horse, chariot, carriage, bike and automobile.
|
 |
|
Seats |
Frequency |
Seats per hour |
| Bus |
50 |
5 mins |
600 |
| Light Rail0 10 mins 1200 |
200 |
10 mins |
1200 |
| JPods, Ultra and other PRT |
4 |
3 secs |
4800 |
| Automobiles |
4 |
1-6 secs |
4800 |
Benefits of shifting from Mass Production to
Just-in-Time can be gained by shifting from Mass Transit to Personal
Automated Mobility.
Manufacturers experienced great productivity gains
moving from Mass Production (focus on the capital asset) to
Just-in-Time (focus on the quality, continuous flow and value of the
process).
Here is a typical impact on a company in the early
1990's when they shifted from Mass Production to Just-in-time
continuous flow ((Womack, Jones, 1996)
Batch & Queue/1991 Flow/1995
Development time for a new product family 3-4 years 1 year
Employee hours per machine 160 80
Manufacturing space per machine 100 square feet 55 square feet
Delivered defects per machine 8.0 0.8
Production throughput time 16 weeks 14 hours to 5 days
Product delivery lead time 4-20 weeks 1-4 weeks
Forty-eight U.S. companies using Just-In-Time work
teams report (Waldo, 1991):
- 35% reduction in cycle time
- 24% reduction in late deliveries
- 30% reduction in hours/unit,
- 33% reduction in work-in-progress inventories
- 58% reduction in scrap rates
- 71% reduction in customer complaints
- 39% reduction in floor space required
Reference: Applying Lessons from Lean Production
Theory to Transit Planning by Dunning and Richert.
Being ultra-light and on-demand, JPods service is
available 24 x 7. Capacity is 100% available 100% of the time. Buses
and trains have limited capacity often and zero capacity much of the
night.
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