An innovative design for left turn bicycles at continuous flow intersections

To improve the practical capacity of the continuous flow intersections (CFI)and eliminate the conflict between left-turn bicycles and through vehicles,an optimization design method for left-turn bicycles was proposed.The pre-stop line for through vehicles and the crossing passage for leftturnbicycles were set at the pre-signal points of the CFI. The control of thethrough vehicles at pre-signal was added in the proposed method. A linearprogramming model was established to achieve the maximum vehicularpractical capacity. The optimization effectiveness and applicability for thisdesign were validated by a case study and sensitivity analyses. The resultsshow that the improvements in practical capacity obtained by the proposedmethod increase with the increase of the left-turn bicycles volumeand through vehicle percentage, while decrease with longer cycle length.As for bicycles, the proposed method can reduce the delay in the case ofhigh traffic demand.Transport and Plannin