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Traffic wave

About: Traffic wave is a research topic. Over the lifetime, 2106 publications have been published within this topic receiving 62117 citations. The topic is also known as: phantom traffic jam & ghost jams.


Papers
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Journal ArticleDOI
TL;DR: This paper shows, based on numerical investigations of the kinetic model of traffic flow, what a process of a formulation of a traffic jam shows qualitatively new peculiarities seen in a slightly inhomogeneous traffic flow.
Abstract: This paper shows, based on numerical investigations of the kinetic model of traffic flow, what a process of a formulation of a traffic jam shows qualitatively new peculiarities seen in a slightly inhomogeneous traffic flow. A traffic jam on a highway can spontaneously appear in a deterministic way; i.e., even if fluctuations in traffic flow are negligible. This effect may be usual for a highway, where traffic flow is always slightly inhomogeneous due to entering traffic to on-ramps and leaving traffic to off-ramps. Such deterministic self-formation of traffic jams is caused by the local breakdown effect, which results in a dynamical local restructuring. Summarizing the results of this article along with two related studies, the whole possible range of density can be divided into four regions: (1) a stable state of traffic flow where any short-time perturbations fade in time; (2) a metastable state, where traffic jams can appear if localized fluctuations occur whose amplitudes exceed the critical value; (3) an unstable state where complex nonhomogeneous nonstationary structures that cover the whole road are formed; and (4) a metastable state where anticlusters and local dipole layers can be formed if localized fluctuations occur whose amplitudes exceed the critical value.

116 citations

01 Jan 2010
TL;DR: In this article, the authors define types of generated traffic, discuss generated traffic impacts, and recommend ways to incorporate generated traffic into evaluation, and describes alternatives to roadway capacity expansion, and describe alternatives to road capacity expansion.
Abstract: Traffic congestion tends to maintain equilibrium. Congestion reaches a point at which it constrains further growth in peak-period trips. If road capacity increases, the number of peak-period trips also increases until congestion again limits further traffic growth. The additional travel is called “generated traffic.” Generated traffic consists of diverted traffic (trips shifted in time, route and destination), and induced vehicle travel (shifts from other modes, longer trips and new vehicle trips). Research indicates that generated traffic often fills a significant portion of capacity added to congested urban road. Generated traffic has three implications for transport planning. First, it reduces the congestion reduction benefits of road capacity expansion. Second, it increases many external costs. Third, it provides relatively small user benefits because it consists of vehicle travel that consumers are most willing to forego when their costs increase. It is important to account for these factors in analysis. This paper defines types of generated traffic, discusses generated traffic impacts, recommends ways to incorporate generated traffic into evaluation, and describes alternatives to roadway capacity expansion.

115 citations

Journal ArticleDOI
TL;DR: The numerical results show that the new car-following model can describe some qualitative properties of the heterogeneous traffic flow consisting of bus and car, which verifies that the model is reasonable.

114 citations

Journal ArticleDOI
TL;DR: It is shown that the mixed traffic system is not completely controllable, but is stabilizable, indicating that AVs can not only suppress unstable traffic waves but also guide the traffic flow to a higher speed.
Abstract: The emergence of autonomous vehicles (AVs) is expected to revolutionize road transportation in the near future. Although large-scale numerical simulations and small-scale experiments have shown promising results, a comprehensive theoretical understanding to smooth traffic flow via AVs is lacking. In this article, from a control-theoretic perspective, we establish analytical results on the controllability, stabilizability, and reachability of a mixed traffic system consisting of human-driven vehicles and AVs in a ring road. We show that the mixed traffic system is not completely controllable, but is stabilizable, indicating that AVs can not only suppress unstable traffic waves but also guide the traffic flow to a higher speed. Accordingly, we establish the maximum traffic speed achievable via controlling AVs. Numerical results show that the traffic speed can be increased by over 6% when there are only 5% AVs. We also design an optimal control strategy for AVs to actively dampen undesirable perturbations. These theoretical findings validate the high potential of AVs to smooth traffic flow.

114 citations

Patent
22 Apr 2010
TL;DR: In this paper, the authors describe techniques for determining and using information regarding expected road traffic flow conditions information for vehicles traveling on roads, which can be used for estimating expected traffic flow condition information for roads with structural flow obstructions that cause reduced traffic flow at certain road locations and times.
Abstract: Techniques are described for determining and using information regarding expected road traffic flow conditions information for vehicles traveling on roads. The expected road traffic flow conditions for a particular portion of a road may be generated by combining historical representative information about road traffic flow conditions for that road portion with current information about actual traffic flow on or near that road portion. The combination may, for example, provide benefits for estimating expected traffic flow conditions information for roads with structural flow obstructions that cause reduced traffic flow at certain road locations and times - for example, the expected traffic flow conditions information may be based at least in part on fitting or otherwise adapting partial actual traffic flow information about a vehicle's actual travel path to a historical travel profile for a road that includes representative traffic flow information for various combinations of road locations and time periods.

113 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202314
202237
202120
202017
201919
201822