Green Light Optimum Speed Advisory (GLOSA) System with Signal Timing Variations - Traffic Simulator Study

Abstract

Green light optimal speed advisory (GLOSA) systems are vehicle-to-everything (V2X) communication applications that transfer signal information between vehicles and traffic lights in order to achieve higher time and energy efficiency together with safer traffic at signalized intersections. This paper focuses on the Red to Green Time (RGT) ratio of traffic lights and evaluates our GLOSA system performance levels and limitations using RGT ratio variations in traffic simulator experiments. Statistical analyses showed that when the RGT ratio is almost 1 (i.e. red time and green time are almost equal), the partial assistance (PA) mode, in which the GLOSA system only activates during red signals, is highly recommended in terms of traffic efficiency and environmental impact. In contrast, when the RGT ratio is less than 1, the full assistance (FA) mode, which assists the vehicle regardless of the signal phase, performed better than the PA mode provided that the travel time is not significantly increased.