The Use of the Output from Vehicle Detectors to Assess Delay in Computer-Controlled Area Traffic Control Systems

摘要

Computer simulation studies of a multi-lane section of road with junctions subject to traffic signal control, are used to establish two models for the prediction of travel time on a link from the output of vehicle detectors. One detector per lane is required for the models described. The first, the 'arrival time model', uses the arrival time of a vehicle at the detector and the occupancy of the detector for 12 1/2 seconds prior to the departure of the vehicle to predict the travel time of the vehicle. The second, the 'occupancy model', uses average detector occupancy over a period of time to predict the average travel time of vehicles on the link during that period. In both cases the model requires as input an estimate of the undelayed travel time on the link and its degree of saturation. In the case of the arrival time model, the offset of the signals on the link also must be known, whilst for the occupancy model the ratio of green times at the upstream and downstream signals is needed.