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Steven Judd
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This problem is prevalent across all trip planners, as it is impossible to know an exact departure time for these maps. As Miles points out, frequent transit does work better, but a compromise for these maps could be showing a minimum and a maximum trip time for lower frequency transit. A similar issue also appears with cars in traffic, as the accuracy of the predictions is only as good as the historical data, or the accuracy of the current travel time.
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Mar 28, 2015