A linked-bottleneck control method for urban expressway on-ramp

Abstract

In order to alleviate the congestion in the mainline of urban expressway caused by the uncertainty of the traffic flow, a linked-bottleneck control method for urban expressway on-ramp is proposed in this paper. Firstly, the downstream dynamic critical occupancy of the on-ramp under uncertainty is predicted by using ESN (Echo State Network). Then, a function for dividing the master-slave ramps is designed to dynamically determine the ramp numbers required coordination and expand the range of coordination control. Considering the designed function changes over time and some factors such as the traffic accidents, weather and so on also affect it, the BP neural network is used to improve its accuracy. The proposed method calculates the on-ramp regulating rate based on the downstream dynamic critical occupancy and expand the range of coordination control by the designed function, which can adapt the changes of actual traffic flow and overcome the defects of some methods such as Bottleneck, Linked-control, Swarm and so on. The simulations show that, compared with some existing methods, the congestion duration and the high density duration in the mainline of the urban expressway are significantly reduced by using the proposed method in this paper.

Traffic Risk Assessment of Lane-Changing Process in Urban Inter-Tunnel Weaving Segment

“…There are many studies on traffic in weaving sections, with urban expressways ( 3 ) and freeways ( 4 ) as the primary research subjects. The research themes focus mainly on vehicle behavior modeling ( 5 ), weaving section capacity, traffic bottleneck analysis ( 6 ), vehicle cooperative control ( 7 ), and so forth. With the development of three-dimensional urban traffic, UIW sections gradually occur in cities.…”