Method for calculating traffic capacity of left-turn lane under left-turn allowable phase

The invention provides a method for calculating the traffic capacity of a left-turn lane under a left-turn allowable phase. The method comprises the following steps of: step 1, collecting basic data;2, calculating the maximum passing vehicle number GpL (pcu) of a left-turn release unit of an intersection; 3, calculating the time t1 (s) of a green light initial stage; 4, calculating the time t2 (s) of a non-green-light initial stage; 5, calculating the traffic capacity CAP1 (pcu/h) of a left-turn lane at the green light initial stage; 6, calculating the traffic capacity CAP2 (pcu/h) of the left-turn lane in the non-green-light initial stage; and step 7, calculating the sum CAPL (pcu/h) of the traffic capacity of the left-turn lane in a whole signal period. According to the method, the mutual influence between left-turn traffic flow and opposite traffic flow under the left-turn allowable phase is considered, so that the traffic capacity of left-turn vehicles at the intersection of the left-turn allowable phase