2017 Volume 3 Issue 2 Pages A_101-A_108
Gridlock phenomenon may cause rapidly traffic congestion to a large area in a large-scale disaster such as huge earthquake. Then, there is a need to prevent the occurrence of gridlock phenomenon and mitigate the impact of it. However, the occurrence condition of gridlock phenomenon according to previous studies does not include signal control parameters explicitly. It is difficult to apply the occurrence condition to improvement of signal control parameters directly. In this paper, first we extend the occurrence condition of gridlock phenomenon on a signalized single network to involve explicitly signal control parameters. Several simulation experiments were conducted for verify our occurrence condition. The experimental results show that our occurrence condition is valid for reproducibility of gridlock phenomenon. Moreover, by focusing on transmission of start wave in a queue, we examined the effects of offset on gridlock phenomenon with traffic flow simulation. As a result, it was revealed that the occurrence of gridlock phenomenon was prevented by synchronizing offset and transmission timing of start wave to the upstream intersection.
