Transit agencies in the USA generally try to strike a balance between the two goals, skewing (by my perception) in favor of coverage.
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The more common term for "coverage transit" in the USA today is "paratransit." People who need it sign up and book trips as needed.
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Unsurprisingly, this sort of service is VERY expensive to provide, relative to conventional "fixed-route" transit.
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In my neck of the woods, a conventional trip costs about $2.50 to provide, a paratransit trip costs about $25.00
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So if guardian transit is what we call paratransit, does that mean that commercial transit is fixed-route? You bet!
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A fixed-route service operates according to a regular schedule, along a specified route, making stops at predetermined locations.
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If you get the schedule, route, and stops right, this sort of transit can be incredibly profitable--as is the case in Tokyo and Osaka.
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The ideal form of coverage transit is something like a taxi (which, as I've mentioned before, is a type of public transit).
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The ideal form of ridership transit is something like a (grade-separated!) train.
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The difference between the two has to do with the sort of networks they run on. The one uses a road system, the other uses dedicated tracks.
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A vehicle on roads stops at most junctions, whenever it needs to change its route. A vehicle on dedicated tracks *only* stops for riders.
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A bus or trolley that operates in mixed transit, by the way, is the worst of both worlds. It stops for every light AND for every stop.
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This has some implications for transit provision: where ridership is too low to justify commercial transit, stick to ensuring coverage.
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On the other hand, where ridership makes commercial transit viable, take all possible steps to ensure dedicated ROW, whether or not on rails
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Coverage transit, which cannot possibly turn a profit, should be provided by the state, as part of a social safety net.
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Commercial transit, however, should aim for privatization and keep costs in line with revenue.
End of conversation
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