When analyzing the effects of an upstream signal in TWSC, what does the “progressed flow” value represent?
Progressed flow is the sum of the feeding volume, from the upstream intersection, that moves during protected through and left turn (green arrow) phases. Approach volume at the unsignalized intersection may be higher than the upstream progressed flow because it also includes upstream left- and right-turn permitted movement flow, as well as any mid-block flow.
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