Design method for signalized intersection turn-around area with two left turning lanes

The invention discloses a design method for a signalized intersection turn-around area with two left turning lanes. The design method is characterized in that in the process of determining the capacities of the two left turning lanes, influences of the running characteristics of turn-around traffic flow on the lane selection behavior of follow-up left turning traffic flow are draw into full consideration, a capacity computation model for the two left turning lanes with the turn-around area is established, then in combination with the actual running characteristics of the intersection, model establishment and simplification are conducted, the optimal position setting of the turn-around area is determined to achieve the purpose of maximizing the comprehensive capacity of the two lanes, and computation of the capacity is more accurate under the situation.