Rapid transit is the backbone of public transportation, especially in large cities, because it allows people to travel quickly between different neighborhoods. It functions best as part of a larger urban mobility system that includes walking and cycling. The Rapid Transit Database (RTDB) presents all publicly available data about every rapid transit line in the world. ITDP maintains the RTDB and updates it annually.
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The Crux Alliance is a project of the Aspen Global Change Institute.
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