A Model of the Traffic Circle Flow Control

In order to improve its capacity and safety, and reduce its control delay, a mathematical model is proposed to optimize the volume control of a traffic circle in this paper. Firstly, for the minimum traffic circles with low traffic volumes, an unsignalized gap-acceptance model is established based on the gap-acceptance theory. And then three corrective measures are obtained to improve the traffic capacity of the traffic circle, which includes: rebuilding the traffic circle, increasing the proportion of queuing vehicles, and decreasing the proportion of right-turn traffic.