Journal ArticleDOI
The cell transmission model, part ii: network traffic
TLDR
This article shows how the evolution of multi-commodity traffic flows over complex networks can be predicted over time, based on a simple macroscopic computer representation of traffic flow that is consistent with the kinematic wave theory under all traffic conditions.Abstract:
This article shows how the evolution of multi-commodity traffic flows over complex networks can be predicted over time, based on a simple macroscopic computer representation of traffic flow that is consistent with the kinematic wave theory under all traffic conditions. The method does not use ad hoc procedures to treat special situations. After a brief review of the basic model for one link, the article describes how three-legged junctions can be modeled. It then introduces a numerical procedure for networks, assuming that a time-varying origin-destination (O-D) table is given and that the proportion of turns at every junction is known. These assumptions are reasonable for numerical analysis of disaster evacuation plans. The results are then extended to the case where, instead of the turning proportions, the best routes to each destination from every junction are known at all times. For technical reasons explained in the text, the procedure is more complicated in this case, requiring more computer memory and more time for execution. The effort is estimated to be about an order of magnitude greater than for the static traffic assignment problem on a network of the same size. The procedure is ideally suited for parallel computing. It is hoped that the results in the article will lead to more realistic models of freeway flow, disaster evacuations and dynamic traffic assignment for the evening commute.read more
Citations
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Data-Driven Methods for Improved Estimation and Control of an Urban Arterial Traffic Network
TL;DR: This thesis contains methodology to improve the estimates obtained from existing hardware by combining data from typical infrastructure sensors with new sources of Lagrangian probe measurements, and explores advancements in theoretically optimal control algorithms for statistically-modeled signalized queueing networks.
Proceedings ArticleDOI
A Distributed Approach for Traffic Signal Synchronization Problem
Ludovica Adacher,Marco Tiriolo +1 more
TL;DR: A solution to the traffic signals problem via simulation is provided, a decomposition of the network is proposed, considering the cooperation between different subnetworks, and the surrogate method is applied to solve the Traffic Signal Synchronization problem.
Journal ArticleDOI
Analytical Derivation of Capacity at Diverging Junctions
TL;DR: In this paper, the authors proposed an analytical model that estimates the capacity at a diverging junction according to the kinematic wave theory of Lighthill, Whitham, and Richards.
Posted Content
Performance analysis and signal design for a stationary signalized ring road
Wen-Long Jin,Yifeng Yu +1 more
TL;DR: This study presents a new method based on the LWR model for performance analysis and signal design in a stationary signalized ring road and derives an explicit macroscopic fundamental diagram (MFD), in which the average flow-rate in stationary states is a function of both traffic density and signal settings.
Journal ArticleDOI
Impact of curbside bus stop locations on mixed traffic dynamics: a bus route perspective
Hui Jin,Jie Yu,Xiaoguang Yang +2 more
TL;DR: Intermittent lane blockage at curb-side bus stops, characterized by aggressive lane changes, undue traffic delay and drop of road capacity, creates the major bottleneck in mixed urban traffic as mentioned in this paper.
References
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Journal ArticleDOI
Shock Waves on the Highway
TL;DR: In this article, a simple theory of traffic flow is developed by replacing individual vehicles with a continuous fluid density and applying an empirical relation between speed and density, which is a simple graph-shearing process for following the development of traffic waves.
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Nonlinear Effects in the Dynamics of Car Following
TL;DR: In this paper, it was shown that a small amplitude disturbance propagates through a series of cars in the manner described by linear theories, except that the dependence of the wave velocity on the car velocity causes an accleration wave to spread as it propagates and a deceleration wave forming a stable shock.
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A simplified theory of kinematic waves in highway traffic, part I: General theory
TL;DR: In this paper, it is shown how a formal solution for A ( x, t ) can be evaluated directly from boundary or initial conditions without evaluation at intermediate times and positions, and the correct solution, which is the lower envelope of all such formal solutions, will automatically have discontinuities in slope describing the passage of a shock.
Journal ArticleDOI
A simplified theory of kinematic waves in highway traffic, part II: Queueing at freeway bottlenecks
TL;DR: In this article, the authors proposed a method to relate the cumulative flow curve at any junction to the net cumulative entrance flow at this junction, and the cumulative curve for the freeway at the next upstream junction and/or the next downstream junction.