saturation headways of left-turn passenger cars at the LWA withsingle and dual left-turn lanes and found that the use of LWAsenhanced the capacity of exclusive left-turn lanes but did notconsiderably affect the saturation headways of left-turn passen-ger cars behind the stop bar. Zhou and Zhuang (2012) evaluatedthe traffic performance at the signalized intersections with theshared lane and LWA and found that the utilization of LWA signif-icantly improved the discharge rate of the through lane withoutcompromising the efficiency of left-turning flows, thus reduc-ing the average vehicle control delay. Previous studies seeminglypoint to the conclusion that LWAs can always improve the trafficcapacity of the signalized intersection. Jin (2006) provided a differ-ent viewpoint that the left-turn traffic capacity actually remainedunchanged regardless of the installation of LWA or not, given thatthe left-turn vehicles could not cross the conflict point (betweenthe left-turn and opposite through movements) until the oppositethrough cleared. Nonetheless, the LWA could effectively reduce theprobability of the overflow of left-turn vehicles at the exclusiveleft-turning lanes.