The VOC distribution of randomization |${{{{R}}}_1}$| after implementing the FC model (a), the SPC model (b) and the GBC model (c). The flow distribution of randomization |${{{{R}}}_1}$| after implementing the FC model (d). The difference of traffic flows when implementing the SPC model and the FC model respectively (e). The difference of traffic flows when implementing the GBC model and the FC model respectively (f).