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"Moving forward with our Fratar Method example, we now need to calculate the projected trips between Zone B and Zone C. Just as we did with Zone A, we must calculate the flow in both directions to reach a balanced final number. First, let's look at T {B C}, the trips starting in B and ending in C. We take Zone B’s future production of 770 trips (that's 700 current trips multiplied by its 1.1 growth factor) and determine C's relative share. We weight the current 300 trips by C's growth factor of