Study on Detecting Location for Bus Rapid Transit with Signal Priority

Three signal priority scenarios were proposed for bus rapid transit(BRT) at isolated intersection based on early green and green extended strategies. The stopping time model of BRT at intersection was built considering signal phase status, detector location and its progression speed. Calculation results were compared with VISSIM simulation results, and the influence of detector location on the stopping time of BRT was analyzed under different progression speeds and cycle time. Results prove the effectiveness of model proposed in this paper. There is critical location for detector to minimize stopping time. When detector is closer to the stopping line than the critical location, stopping time decreases with detector's distance far away from stopping line. When it is beyond the critical location, stopping time is approaching to some stable value. Moreover, higher speed of bus causes longer stopping time and results in further critical location. Critical location almost has nothing to do with signal cycle time.