An Innovative Signal Timing Strategy for Implementing Contraflow Left-Turn Lanes at Signalized Intersections with Split Phasing

Contraflow Left-Turn Lanes (CLLs) have the potential of being a solution for mitigating congestions at signalized intersections where split phasing is recommended or required. However, current signal timing strategy with CLLs cannot be directly applied (SIWSP). To address this problem, study proposed an innovative strategy, which referred to as Counterclockwise Split Phasing (CSP) timing, implementing SIWSPs. A traffic simulation-based case was conducted and results indicate that, by using CSP plan, can implemented SIWSP significantly reduce caused high left-turn demand type intersection. In addition, since design procedure has fully considered clearance time requirements vehicles on CLLs, risk associated use controlled makes it safe intersection