An efficient and accurate measurement of congestion intensity helps investigate the traffic conditions at different road classes and provides useful information for transportation planning and traffic operation improvement. However, the existing traffic congestion intensity measurement models often suffer from two major problems: one is that there is no generally accepted method that can be use...

This paper presents a traffic control system, called ARTC, which addresses frequent oc­ currences of congestion and provides areawide traffic progression. The signal controllers in ARTC are interconnected through a computer network. By exchanging traffic flow in­ formation among the signal controllers, ARTC provides a new concept in areawide traffic control. With a global view of the traffic in...

In this paper we consider ABR traffic which shares an output port of a switch with delay sensitive CBR/VBR traffic. Congestion control of the ABR traflic is achieved by mean? of an Explicit Rate control scheme. Two important performance measurea are evaluated using an analytical model : the ABR-buffer occupancy distribution in the switch and the ABR traffic throughput. We consider two types of ...

In urban transportation networks, research work has been focusing on alleviating the traffic congestion to optimize the network performance, such as increasing the traffic flow and decreasing the user travel time. However, studying the physical properties of traffic propagation and congestion growing has always been a difficult task, especially in a large and complex transportation network. Pre...

The Quantized Congestion Notification (QCN) is a Layer 2 congestion control scheme for Carrier Ethernet data center networks. The QCN has been standardized as an IEEE 802.1Qau Ethernet Congestion Notification standard. This paper report a results of a QCN study with multicast traffic and proposes an enhancement to the QCN. In fact, in order to be able to scale up, the feedback implosion problem...

A discussion of the causes and impacts of recurring and non-recurring congestion accompanied with a review of potential solutions and existing examples. While congestion is a broad and subjective matter, research focused on the separate causes of recurring congestion – mainly capacity and behavioral issues – and non-recurring congestion – mainly incidents which cause unexpected congestion and t...

This article discusses the simulation and evaluation of a traffic congestion detection system which combines inter-vehicular communications, fixed roadside infrastructure and infrastructure-to-infrastructure connectivity and big data. The system discussed in this article permits drivers to identify traffic congestion and change their routes accordingly, thus reducing the total emissions of CO₂ ...

Across the nation, traffic growth and congestion continue to outpace growth in highway capacity. A large amount of this congestion occurs at intersections, rather than along the links between intersections, it is of utmost importance that traffic engineers use every available technique for improving intersection performance and safety. This paper examines the benefits of roundabouts as an alter...

We consider the congestion-control problem in a communication network with multiple traffic sources, each modeled as a fullycontrollable stream of fluid traffic. The controlled traffic shares a common bottleneck node with high-priority cross traffic described by a Markovmodulated fluid (MMF). Each controlled source is assumed to have a unique round-trip delay. We wish to maximize a linear combi...

Traffic congestion is an important problem faced by Intelligent Transportation Systems (ITS), requiring models that allow predicting the impact of different solutions on urban traffic flow. Such an approach typically requires the use of simulations, which should be as realistic as possible. However, achieving high degrees of realism can be complex when the actual traffic patterns, defined throu...