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CityLab:

Developed by a group of Code for America fellows, TransitMix is conceived as “a sketching tool for transit planners (both professional and armchair) to quickly design routes and share with the public.“ To start, pick a city*.  Then, drag and drop points to snap your bus line to the street grid. And by changing variables like headway and peak hours, you get outputs like how many buses would be required during peak hours and an estimate of how much the line would cost to operate.

Image may be NSFW.
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