An experimental study on mitigation of expressway traffic congestion with LED information board

Provision of traffic information to drivers around bottleneck by Light Emitting Diode (LED) information board has been expected as a new congestion antidote which will mitigate congestions in the normal sections of expressways with considerably low costs. It has already been reported that LED sign car may increase congested flow rate as the result of guiding drivers to accelerate their speeds during congestion. The study aims to verify the effect of LED information board to increase the bottleneck capacity during congestion as well as the maximum flow rate before congestion. As the result of the survey, it is shown that through provision of dynamic traffic information of congestion via LED information board will increase the congested flow rate at the bottleneck. However, it is difficult to show a clear increase of the maximum flow rate before congestion.