Simulation Modeling of the Advance Time in Coordination Plan on City Highways
Keywords
Abstract
The offsets is one of the most important parameters affecting the effectiveness of coordinated traffic signal control. It is used to ensure the continuous movement of the platoon progression on coordinated segments of the road network. In addition, the complexity of the task of finding the optimal values of the advance time of coordinated traffic signals on urban highways is that it is taken into account in: the time of the traffic light cycle and the time of the traffic light offset Experimental evaluation of the accuracy of analytical models for determining the advance time of the traffic signal, based on the average acceleration and the linearly decreasing nature of the change in the acceleration of a car when moving from a standstill from the stop line of the intersection in coordination plan. Using micromodeling tools (VISSIM), a simulation model of car traffic on a one-lane coordinated segment of a city highway was formed. To obtain the basic settings of traffic lights, experiments were conducted on the time of car movement in free conditions for coordinated sections of 300…800 m in length. After that, the progression platoon movement was simulated between two coordinated intersections at different values of the advance time. Based on the deter-mined minimum values of the vehicle travel time along the coordinated segment, the corresponding values of the advance time are determined, which are used to assess the accuracy of its calculation using the proposed analytical models. The results of the experimental evaluation of the analytical models for determining the advance time indicate their sufficiently high accuracy. The highest accuracy is characterized by the analytical model that takes into account the linearly decreasing nature of the change in vehicle acceleration when moving along a coordinated segment of a city high-way. The deviation of the average value of the advance time when it is used on sections whose length varies in the range of 300…800 m is 0.04 s. The presented analytical models are based on the assumption that it is necessary to ensure a smooth movement of the progression platoon and taking into account the influence of different characteristics of vehicle acceleration when driving along coordinated segments of city highways. The use of the developed analytical models makes it possible to obtain an initial starting point for adjusting the advance time of traffic signal cycles in coordination plan.
