The Continuous Flow Intersection (CFI) is an at grade intersection that moves left tuning vehicles conflicting with the through movements (to the left where traffic drives on the right, and visa-versa) out of the signalised intersection.
The left turning traffic removed at a signalised cross over point several hundred feet prior to arriving at the primary intersection. Doing this allows for the removal of the left turn signal phase at the primary intersection, thus providing extra green time on alternative movements.
This design of intersection is not uncommon in the United States with more than 40 instated in the past decade.
Although a complicated junction to model using microsimulation products, Quadstone Paramics modeller is a highly effective tool for managing to model junctions with a high degree of lane choice on junction approach arms and control vehicle behaviour on weaving sections of the network. To demonstrate, I have prepared a short movie on the operation of a CFI in West Valley City, Utah (40.696690°N 111.980920°W).
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