1. The percentage of inter/intra-zonal trips using some mode of mass transit as opposed to the use of private automobiles. The choice or “split” between modes can be modeled as a function of variables which describe both the transportation alternatives and the socio-economic characteristics of those who would avail themselves of the alternatives; 2. Term which describes how many people use alternative forms of transportation, frequently used to describe the percentage of people using public transit.

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