Although it becomes difficult for every city to operate bus service by increasing motorization, there are some opinions to doubt the justice of public subsidy and to point out institutional restraints in Japan.
In this paper, the situation and reason which make the public subsidy inevitable, is discussed enough. And then, a method of practicing subsidies overcoming these restrictions is considered. Consequently a measurement named the route-potential is introduced and defined. Using this measurement, we can distinguish the bus route which may be subsidized, and manage the productivity under the subsidized system.
This calculation is applied in each bus route in Nagoya and usefulness of this measurement is confirmed.
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