A new methodology is proposed to establish practical guidelines for four incremental left-turn treatments: (a) permissive single left-turn lane, (b) protected–permissive single left-turn lane, (c) protected dual left-turn lanes with equal lane use, and (d) protected dual left-turn lanes with unequal lane use. Decision boundaries were derived from the equilibrium at which the delays of two incremental treatments were equal. The benefits and costs associated with different left-turn treatments—including safety impact and construction and maintenance costs—also were considered. These benefits and costs effectually shift the boundary curves for more realistic decision making.
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