Abstract: An integrated model was proposed for the optimization of signal timings for main-signal and pre-signal and their coordination on the approach of intersection with two stop lines and pre-signals. A set of constraints were taken into account in the model, including the number of lanes before the pre-signal and main-signal, the saturated flow of each movement, the cycle length and the length of sorting area. The queue evolution process of different movements (through movement and left turn movement) in the sorting was also addressed in detail. The proposed model is validated by a case study of a signalized intersection using field data. For a given traffic demand, the proposed model can meet the same degree of saturation with less total green time compared with traditional methods.

Key words: engineering of communications and transportation system, signal coordination, two stop-lines, pre-signal, queue length