An approach to optimize the settings of actuated signals

摘要

Traffic-actuated signal employs relatively complex control logic to regulate traffic flow.Introduction of control variables into the traffic-actuated system contributes to system operational flexibility and complexity,and also complicates the system with uncertainties.The paper proposes two tentative methods to optimize the actuated signal parameters:basic requirements of controller parameters and analytical model,and macroscopic computer simulation.It is concluded that when the actuated signal operates within the volume/capacity range of 0.4 to 0.6,it will create the most significant benefits;the research suggests that minimum green time in the main street shall be set long enough to meet the required demand,preferably at the 60 of the main street capacity.In order to ensure less control delay in a semi-actuated intersection,relatively small values of vehicle extension(e.g.,2.5 s) and maximum green time are recommended to be assigned to the less important street.