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Dynamic traffic assignment model based on gps data and point of interest (poi) in shanghai.

dynamic traffic assignment model

1. Introduction

2. materials and methods.

  • Determine the initial value. Initial point x 0 ∈ S , given an error ε > 0 , k = 0 ;
  • Solve the approximate linear programming: min ∇ f ( x k ) T x ,   s . t   x ∈ S , to obtain the optimal solution y k ;
  • Construct feasible descent directions, let d k = y k − x k , if | | ∇ f ( x k ) T x | | ≤ ε , stop the computation and output x k ; otherwise go to the next step.
  • One-dimensional search: min 0 ≤ λ ≤ 1 f ( x k + λ d k ) to get step λ k . Let x k + 1 = x k + λ k d k ,   k updated to k + 1 , go to the second step.

3. Experiments

3.1. data description, 3.2. performance indexes, 4. interpretation of results, 4.1. the results of poi impact, 4.1.1. qualitative analysis, 4.1.2. qualitative analysis, 4.2. the results of user equilibrium model, 5. conclusions, author contributions, institutional review board statement, informed consent statement, data availability statement, conflicts of interest.

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Click here to enlarge figure

FlowCongestion LevelDescription
(a)33LightThe red area of the link is small, and the road congestion is light.
(b)65HeavyThe red area of the link is increasing, which means that parent pick-up vehicles are gathering.
(c)52HeavyThe red area of the link decreases, because the parents’ pick-up vehicles are parked in front of the kindergarten waiting for the children to be released. The speed is null and is not counted in the track data, and this type of data points is not shown on the heat map.
(d)71HeavyThe red area of the link increases as most of the parents have received their children. There is a short period of congestion caused by them leaving the link.
(e)46LightThe red area of the link decreases, and the road is reopened.
No. of LinkLinkLength (km)Free Time (s)CapacityFlowV/C
1[‘1’, ‘5’]0.410.006820002130.106
2[‘1’, ‘6’]0.620.010320001590.08
3[‘2’, ‘5’]0.840.01420001250.062
4[‘2’, ‘3’]0.640.010710001040.104
5[‘3’, ‘2’]0.640.01071000480.048
6[‘3’, ‘6’]0.930.01552000750.038
7[‘3’, ‘4’]0.670.01121000470.047
8[‘5’, ‘2’]0.840.01420002440.122
9[‘5’, ‘1’]0.410.00682000890.044
10[‘5’, ‘6’]0.320.00531000500.05
11[‘6’, ‘4’]0.550.00922000950.048
12[‘6’, ‘1’]0.620.01032000750.037
13[‘6’, ‘5’]0.320.0053100000
14[‘6’, ‘3’]0.930.015520001140.057
No. OD PairOD PairsDemandNo. of PathTime [s]Paths
0[‘1’, ‘1’]000[‘1’]
1[‘1’, ‘2’]103
20.062[‘1’, ‘5’, ‘6’, ‘3’, ‘2’]
30.0465[‘1’, ‘6’, ‘5’, ‘2’]
40.0465[‘1’, ‘6’, ‘3’, ‘2’]
2[‘1’, ‘3’]11450.0465[‘1’, ‘5’, ‘2’, ‘3’]
60.0465[‘1’, ‘5’, ‘6’, ‘3’]
70.062[‘1’, ‘6’, ‘5’, ‘2’, ‘3’]
3[‘1’, ‘4’]4590.0775[‘1’, ‘5’, ‘2’, ‘3’, ‘6’, ‘4’]
100.062[‘1’, ‘5’, ‘2’, ‘3’, ‘4’]
110.0465[‘1’, ‘5’, ‘6’, ‘4’]
120.062[‘1’, ‘5’, ‘6’, ‘3’, ‘4’]
140.0775[‘1’, ‘6’, ‘5’, ‘2’, ‘3’, ‘4’]
150.0465[‘1’, ‘6’, ‘3’, ‘4’]
4[‘1’, ‘5’]110
170.031[‘1’, ‘6’, ‘5’]
180.062[‘1’, ‘6’, ‘3’, ‘2’, ‘5’]
5[‘2’, ‘1’]44
200.0465[‘2’, ‘5’, ‘6’, ‘1’]
210.0465[‘2’, ‘3’, ‘6’, ‘1’]
220.062[‘2’, ‘3’, ‘6’, ‘5’, ‘1’]
6[‘2’, ‘2’]0230[‘2’]
7[‘2’, ‘3’]60240.062[‘2’, ‘5’, ‘1’, ‘6’, ‘3’]
250.0465[‘2’, ‘5’, ‘6’, ‘3’]
8[‘2’, ‘4’]2270.062[‘2’, ‘5’, ‘1’, ‘6’, ‘4’]
280.0775[‘2’, ‘5’, ‘1’, ‘6’, ‘3’, ‘4’]
290.0465[‘2’, ‘5’, ‘6’, ‘4’]
300.062[‘2’, ‘5’, ‘6’, ‘3’, ‘4’]
310.0465[‘2’, ‘3’, ‘6’, ‘4’]
9[‘2’, ‘5’]51
340.062[‘2’, ‘3’, ‘6’, ‘1’, ‘5’]
350.0465[‘2’, ‘3’, ‘6’, ‘5’]
10[‘3’, ‘1’]75360.0465[‘3’, ‘2’, ‘5’, ‘1’]
370.062[‘3’, ‘2’, ‘5’, ‘6’, ‘1’]
390.0465[‘3’, ‘6’, ‘5’, ‘1’]
11[‘3’, ‘2’]18
410.062[‘3’, ‘6’, ‘1’, ‘5’, ‘2’]
420.0465[‘3’, ‘6’, ‘5’, ‘2’]
12[‘3’, ‘3’]0430[‘3’]
13[‘3’, ‘4’]45440.0775[‘3’, ‘2’, ‘5’, ‘1’, ‘6’, ‘4’]
450.062[‘3’, ‘2’, ‘5’, ‘6’, ‘4’]
460.031[‘3’, ‘6’, ‘4’]
14[‘3’, ‘5’]30
490.0465[‘3’, ‘6’, ‘1’, ‘5’]
15[‘5’, ‘1’]45510.062[‘5’, ‘2’, ‘3’, ‘6’, ‘1’]
530.031[‘5’, ‘6’, ‘1’]
16[‘5’, ‘2’]99
550.062[‘5’, ‘1’, ‘6’, ‘3’, ‘2’]
560.0465[‘5’, ‘6’, ‘3’, ‘2’]
17[‘5’, ‘3’]42
580.0465[‘5’, ‘1’, ‘6’, ‘3’]
18[‘5’, ‘4’]50600.062[‘5’, ‘2’, ‘3’, ‘6’, ‘4’]
610.0465[‘5’, ‘2’, ‘3’, ‘4’]
620.0465[‘5’, ‘1’, ‘6’, ‘4’]
630.062[‘5’, ‘1’, ‘6’, ‘3’, ‘4’]
650.0465[‘5’, ‘6’, ‘3’, ‘4’]
19[‘5’, ‘5’]0660[‘5’]
Link[‘1’, ‘5’][‘1’, ‘6’][‘2’, ‘5’][‘2’, ‘3’][‘3’, ‘2’][‘3’, ‘6’][‘3’, ‘4’][‘5’, ‘2’][‘5’, ‘1’][‘5’, ‘6’][‘6’, ‘4’][‘6’, ‘1’][‘6’, ‘5’][‘6’, ‘3’]
213159125104487547244895095750114
149124921045291812058712714212286165

Share and Cite

Song, X.; Yang, Z.; Wang, T.; Li, C.; Zhang, Y.; Chen, G. Dynamic Traffic Assignment Model Based on GPS Data and Point of Interest (POI) in Shanghai. Sensors 2021 , 21 , 7341. https://doi.org/10.3390/s21217341

Song X, Yang Z, Wang T, Li C, Zhang Y, Chen G. Dynamic Traffic Assignment Model Based on GPS Data and Point of Interest (POI) in Shanghai. Sensors . 2021; 21(21):7341. https://doi.org/10.3390/s21217341

Song, Xueying, Zheng Yang, Tao Wang, Chaoyang Li, Yi Zhang, and Ganyu Chen. 2021. "Dynamic Traffic Assignment Model Based on GPS Data and Point of Interest (POI) in Shanghai" Sensors 21, no. 21: 7341. https://doi.org/10.3390/s21217341

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dynamic traffic assignment model

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Dynamic traffic assignment: model classifications and recent advances in travel choice principles

Dynamic Traffic Assignment (DTA) has been studied for more than four decades and numerous reviews of this research area have been conducted. This review focuses on the travel choice principle and the classification of DTA models, and is supplementary to the existing reviews. The implications of the travel choice principle for the existence and uniqueness of DTA solutions are discussed, and the interrelation between the travel choice principle and the traffic flow component is explained using the nonlinear complementarity problem, the variational inequality problem, the mathematical programming problem, and the fixed point problem formulations. This paper also points out that all of the reviewed travel choice principles are extended from those used in static traffic assignment. There are also many classifications of DTA models, in which each classification addresses one aspect of DTA modeling. Finally, some future research directions are identified.

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dynamic traffic assignment model

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This chapter presents the fundamentals of the theory and techniques of traffic assignment problem. It first presents the steady-state traffic assignment problem formulation which is also called static assignment, followed by Dynamic Traffic Assignment (DTA), where the traffic demand on the network is time varying. The static assignment problem is shown in a mathematical programming setting for two different objectives to be satisfied. The first one where all users experience same travel times in alternate used routes is called user-equilibrium and another setting called system optimum in which the assignment attempts to minimize the total travel time. The alternate formulation uses variational inequality method which is also presented. Dynamic travel routing problem is also reviewed in the variational inequality setting. DTA problem is shown in discrete and continuous time in terms of lumped parameters as well as in a macroscopic setting, where partial differential equations are used for the link traffic dynamics. A Hamilton–Jacobi- based travel time dynamics model is also presented for the links and routes, which is integrated with the macroscopic traffic dynamics. Simulation-based DTA method is also very briefly reviewed. This chapter is taken from the following Springer publication and is reproduced here, with permission and with minor changes: Pushkin Kachroo, and Neveen Shlayan, “Dynamic traffic assignment: A survey of mathematical models and technique,” Advances in Dynamic Network Modeling in Complex Transportation Systems (Editor: Satish V. Ukkusuri and Kaan Özbay) Springer New York, 2013. 1-25.

This chapter is taken from the following Springer publication and is reproduced here, with permission and with minor changes: Pushkin Kachroo, and Neveen Shlayan, “Dynamic traffic assignment: A survey of mathematical models and techniques,” Advances in Dynamic Network Modeling in Complex Transportation Systems (Editor: Satish V. Ukkusuri and Kaan Özbay) Springer New York, 2013. 1–25.

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Department of Electrical and Computer Engineering, University of Nevada, Las Vegas, NV, USA

Pushkin Kachroo

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Kachroo, P., Özbay, K.M.A. (2018). Traffic Assignment: A Survey of Mathematical Models and Techniques. In: Feedback Control Theory for Dynamic Traffic Assignment. Advances in Industrial Control. Springer, Cham. https://doi.org/10.1007/978-3-319-69231-9_2

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Dynamic Traffic Assignment: A Primer

  • Y. Chiu , J. Bottom , +4 authors Jim Hicks
  • Published 1 June 2011
  • Engineering
  • Transportation research circular

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Application of dynamic traffic assignment to advanced managed lane modeling., improved calibration method for dynamic traffic assignment models, investigating regional dynamic traffic assignment modeling for improved bottleneck analysis: final report, a general framework for modeling shared autonomous vehicles with dynamic network-loading and dynamic ride-sharing application, extending travel-time based models for dynamic network loading and assignment, to achieve adherence to first-in-first-out and link capacities, advances in dynamic traffic assignment models, deploying a dynamic traffic assignment model for the sydney region, study on traveler oriented dynamic traffic assignment problems.

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A Discrete-Flow Form of the Point-Queue Model

Strategic dynamic traffic assignment incorporating travel demand uncertainty, 32 references, online deployment of dynamic traffic assignment: architecture and run-time management, linear programming formulations for system optimum dynamic traffic assignment with arrival time-based and departure time-based demands, dynamic traffic assignment modeling for incident management, location configuration design for dynamic message signs under stochastic incident and atis scenarios, foundations of dynamic traffic assignment: the past, the present and the future, how reliable is this route, calibration and application of a simulation-based dynamic traffic assignment model, dynamic traffic assignment in design and evaluation of high-occupancy toll lanes, a simultaneous route and departure time choice equilibrium model on dynamic networks, off-line calibration of dynamic traffic assignment models, related papers.

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Dynamic Traffic Assignment

Early Experiences

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(opens new window) is a hot topic in travel forecasting.

# Background

Traditional user equilibrium highway assignment models predict the effects of congestion and the routing changes of traffic as a result of that congestion. They neglect, however, many of the details of real-world traffic operations, such as queuing, shock waves, and signalization. Currently, it is common practice to feed the results of user equilibrium traffic assignments into dynamic network models as a mechanism for evaluating these policies. The simulation models themselves, however, do not predict the routing of traffic, and therefore are unable to account for re-routing owing to changes in congestion levels or policy, and can be inconsistent with the routes determined by the assignment. Dynamic network models overcome this dichotomy by combining a time-dependent shortest path algorithm with some type of simulation (often meso or macroscopic) of link travel times and delay. In doing so it allows added reality and consistency in the assignment step, as well as the ability to evaluate policies designed to improve traffic operations. These are some of the main benefits of dynamic network models .

DTA models can generally be classified by how they model link or intersection delay. Analytical DTA models treat it in the same manner as static equilibrium assignment models, with no explicit representation of signals. Link capacity functions, often similar or identical to those used in static assignment, are used to calculate link travel times. Analytical models have been widely used in research and for real-time control system applications. Simulation-based DTA models include explicit representation of traffic control devices. Such models require detailed signal parameters to include phasing, cycle length, and offsets for each signal in the network. Delay is calculated for each approach, with vehicles moving from one link to the next only if available downstream capacity is available. The underlying traffic model is often different, but at the network level such models behave in a similar fashion.

Demand is specified in the form of origin–destination matrices for short time intervals, typically 15 minutes each. Trips are typically randomly loaded onto the network during each time interval. As with traffic microsimulation models, adequate downstream capacity must be present to load the trips onto the network. The shortest paths through time and space are found for each origin–destination pair, and flows loaded to these paths. A generalized flowchart of the process is shown below.

Typical DTA model flow

As with static assignment models, the process shown above is iteratively solved until a stable solution is reached. The memory and computing requirements of DTA, however, are orders of magnitude larger than for static assignment, reducing the number of iterations and paths that can be kept in memory. Instead of a single time period, as with static assignment, DTA models must store data for each time interval as well. A three-hour static assignment would involve only one time interval. A DTA model of the same period, however, might require 12 intervals, each 15 minutes in duration. These are all in addition to the memory requirements imposed by the number of user classes and zones.

# Early Experiences

Research into DTA dates back several decades, but was largely limited to academics working on its formulation and theoretical aspects. DTA overcomes the limitations of static assignment models, although at the cost of increased data requirements and computational burden. Moreover, software platforms capable of solving the DTA problem for large urban systems and experience in their use are recent developments.

(opens new window) has been successfully applied to a large subarea of Calgary and to analyses of the Rue Notre-Dame in Montreal. Although user group presentations of both applications have been made, and reported very encouraging results, the work is currently unpublished and inaccessible except through contact with the developers.

(opens new window) . The network from the Atlanta Regional Commission (ARC) regional travel model formed the starting point for the DTA network. Intersections were coded, centroid connectors were re-defined, and network coding errors were corrected. A signal synthesizer derived locally optimal timing parameters for more than 2,200 signalized intersections in the network. Trip matrices from the ARC model were divided into 15-minute intervals for the specification of demand. Approximately 40 runs of the model were required to diagnose coding and software errors. Unfortunately, the execution time for the model was approximately one week per run. The resulting model eventually validated well to observed conditions; however, the length of time required to render it operational and the run time required prevented it from being used in studies as originally intended. Subsequent work by the developer has resulted in substantial reductions in run time, but this remains a significant issue that must be overcome before such models can be more widely used.

# Current Practices

# research needs.

A number of cities are currently testing DTA models, but are not far enough along in their work to share even preliminary results. At least a dozen such cases are known to be in varying stages of planning or execution, suggesting that the use of DTA models in planning applications is about to expand dramatically. However, in addition to the issue of long run times, a number of other issues must be addressed before such models are likely to be widely adopted:

  • Criteria for the validation of such models have not been widely accepted. The paucity of traffic counts in most urban areas, and especially at 15, 30, or 60 minute intervals, is a significant barrier to definitive assessment of these models.

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Computer Science > Machine Learning

Title: heterogeneous graph sequence neural networks for dynamic traffic assignment.

Abstract: Traffic assignment and traffic flow prediction provide critical insights for urban planning, traffic management, and the development of intelligent transportation systems. An efficient model for calculating traffic flows over the entire transportation network could provide a more detailed and realistic understanding of traffic dynamics. However, existing traffic prediction approaches, such as those utilizing graph neural networks, are typically limited to locations where sensors are deployed and cannot predict traffic flows beyond sensor locations. To alleviate this limitation, inspired by fundamental relationship that exists between link flows and the origin-destination (OD) travel demands, we proposed the Heterogeneous Spatio-Temporal Graph Sequence Network (HSTGSN). HSTGSN exploits dependency between origin and destination nodes, even when it is long-range, and learns implicit vehicle route choices under different origin-destination demands. This model is based on a heterogeneous graph which consists of road links, OD links (virtual links connecting origins and destinations) and a spatio-temporal graph encoder-decoder that captures the spatio-temporal relationship between OD demands and flow distribution. We will show how the graph encoder-decoder is able to recover the incomplete information in the OD demand, by using node embedding from the graph decoder to predict the temporal changes in flow distribution. Using extensive experimental studies on real-world networks with complete/incomplete OD demands, we demonstrate that our method can not only capture the implicit spatio-temporal relationship between link traffic flows and OD demands but also achieve accurate prediction performance and generalization capability.
Comments: 9 pages, 5 figures
Subjects: Machine Learning (cs.LG)
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  1. [PDF] Dynamic Traffic Assignment: A Primer

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  3. 1: General framework of the Dynamic Traffic Assignment (DTA) Model

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COMMENTS

  1. Dynamic traffic assignment: A review of the ...

    A semi-dynamic traffic assignment model can be considered a series of connected STA models (e.g., Nakayama and Conors, 2014). Unlike STA, a semi-dynamic traffic assignment model has multiple time periods for route choice and allows the residual traffic of one period to transfer to the following time periods.

  2. PDF Dynamic Traffic Assignment

    Now, after decades of research and intensive market readiness developments, dynamic traffic assignment (DTA) models have become a viable modeling option. DTA models supplemental existing travel forecasting models and microscopic traffic simulation models. Travel forecasting models represent the static regional travel analysis capability ...

  3. PDF Dynamic Traffic Assignment: Model Classifications and Recent Advances

    1 Dynamic Traffic Assignment: Model Classifications and Recent Advances in Travel Choice Principles W.Y. SZETO a, S.C. WONG a,b a Department of Civil Engineering, The University of Hong Kong, Hong Kong, China b E-mail: [email protected] Abstract: Dynamic Traffic Assignment (DTA) has been studied for more than four decades and numerous reviews of this research area have been conducted.

  4. Dynamic traffic assignment: model classifications and recent ...

    Dynamic Traffic Assignment (DTA) has been studied for more than four decades and numerous reviews of this research area have been conducted. This review focuses on the travel choice principle and the classification of DTA models, and is supplementary to the existing reviews. The implications of the travel choice principle for the existence and uniqueness of DTA solutions are discussed, and the ...

  5. Dynamic Traffic Assignment Model Based on GPS Data and Point of ...

    Dynamic traffic flow, which can facilitate the efficient operation of traffic road networks, is an important prerequisite for the application of reasonable assignment of traffic demands in an urban road network. In order to improve the accuracy of dynamic traffic flow assignment, this paper proposes a dynamic traffic flow assignment model based on GPS trajectory data and the influence of POI.

  6. PDF Guidebook on the Utilization of Dynamic Traffic Assignment in Modeling

    This guidebook on the utilization of Dynamic Traffic Assignment (DTA) complements and enhances other existing guidebooks on modeling by traffic providing guidance on DTA. Since DTA modeling is a new and emerging technique, basic DTA modeling methods and techniques are discussed in this guidebook.

  7. Dynamic traffic assignment: model classifications and recent advances

    Dynamic Traffic Assignment (DTA) has been studied for more than four decades and numerous reviews of this research area have been conducted. This review focuses on the travel choice principle and the classification of DTA models, and is supplementary to the existing reviews. The implications of the travel choice principle for the existence and uniqueness of DTA solutions are discussed, and the ...

  8. (PDF) Dynamic traffic assignment: Model classifications and recent

    Dynamic traffic assignment: model classifications and recent advances in travel choice principles 2 tim e so t h a t t hey arri ve at B a t 9:00 am sh arp, bu t the y wast e a lot of tim e que u ...

  9. Dynamic Traffic Assignment: A Survey of Mathematical Models and

    Abstract. This paper presents a survey of the mathematical methods used for modeling and solutions for the traffic assignment problem. It covers the static (steady-state) traffic assignment techniques as well as dynamic traffic assignment in lumped parameter and distributed parameter settings. Moreover, it also surveys simulation-based solutions.

  10. Traffic Assignment: A Survey of Mathematical Models and Techniques

    This chapter is taken from the following Springer publication and is reproduced here, with permission and with minor changes: Pushkin Kachroo, and Neveen Shlayan, "Dynamic traffic assignment: A survey of mathematical models and techniques," Advances in Dynamic Network Modeling in Complex Transportation Systems (Editor: Satish V. Ukkusuri and Kaan Özbay) Springer New York, 2013. 1-25.

  11. PDF Foundations of Dynamic Traffic Assignment: The Past, the Present and

    Srinivas Peeta1 and Athanasios K. Ziliaskopoulos2. Abstract: Dynamic Traffic Assignment (DTA) has evolved substantially since the pioneering work of Merchant and Nemhauser. Numerous formulations and solutions approaches have been introduced ranging from mathematical programming, to variational inequality, optimal control, and simulation-based.

  12. A cell-based dynamic traffic assignment model: Formulation and

    This paper developed a cell-based dynamic traffic assignment (DTA) formulation that follows the ideal dynamic user optimal (DUO) principle. Through defining an appropriate gap function, we transformed a formulation based on the nonlinear complementarity problem to an equivalent mathematical program. To improve the accuracy of dynamic traffic ...

  13. Dynamic Traffic Assignment: A Primer

    This circular is designed to help explain the basic concepts and definitions of dynamic traffic assignment (DTA) models and addresses the application, selection, planning, and execution of a DTA model. The report also describes the general DTA modeling procedure and modeling issues that may concern a model user.

  14. Calibration and validation of a simulation-based dynamic traffic

    1. Introduction. Simulation-based dynamic traffic assignment (DTA) is an effective tool for analyzing transportation systems for both operational and planning purposes [1], [2], [3].A DTA model replicates network traffic dynamics and captures the interactions between travelers and the transportation network.

  15. Dynamic Traffic Assignment

    Dynamic network assignment models (also referred to as dynamic traffic assignment models or DTA) capture the changes in network performance by detailed time-of-day, and can be used to generate time varying measures of this performance. They occupy the middle ground between static macroscopic traffic assignment and microscopic traffic simulation ...

  16. Advances in Dynamic Traffic Assignment Models

    This paper handles the findings of three recent dynamic traffic assignment models, namely; 1) A dynamic traffic assignment model for highly congested urban networks; 2) System-optimal dynamic traffic assignment with and without queue spillback: Its path-based formulation and solution via approximate path marginal cost; and 3) A dynamic traffic ...

  17. PDF Dynamic Traffic Assignment: Properties and Extensions

    The properties of dynamic traffic assignment (DTA) have important implications on its ability to portray the actual travel behaviour, and hence on the fidelity and accuracy of the model results. These properties depend strongly on the two components of DTA: the travel choice principle and the traffic-flow component. The travel choice principle

  18. Heterogeneous Graph Sequence Neural Networks for Dynamic Traffic Assignment

    Traffic assignment and traffic flow prediction provide critical insights for urban planning, traffic management, and the development of intelligent transportation systems. An efficient model for calculating traffic flows over the entire transportation network could provide a more detailed and realistic understanding of traffic dynamics. However, existing traffic prediction approaches, such as ...

  19. New Algorithm for a Multiclass Dynamic Traffic Assignment Model

    The three classes of users are integrated into one dynamic traffic assignment (DTA) model and solved using a newly proposed algorithm. In this paper, variables of link flow and exit flow are represented solely by in-flow. The resulting linear program subproblem in the inner iteration is proved and solved as a typical time-dependent shortest ...

  20. PDF A Comparison of Static and Dynamic Traffic Assignment Under Tolls: A

    comparison of static traffic assignment with the VISTA model, a simulation-based dynamic traffic assignment approach, and with an approximation to DTA using an add-in for TransCAD software. A novel demand profiling algorithm based on piecewise linear curves is developed, and a method to enable reasonable comparisons of static traffic assignment ...

  21. Heterogeneous Graph Sequence Neural Networks for Dynamic Traffic Assignment

    An efficient model for calculating traffic flows over the entire transportation network could provide a more detailed and realistic understanding of traffic dynamics.

  22. A dynamic traffic assignment model with traffic-flow relationships

    A dynamic traffic assignment model 57 problems in using network optimization algorithms as will be clear later. It is indeed possible to think of zero-cost backward links connecting the head node of a dJink to the tail node of the dJink the next time step, thus forming a conventional connected path). The static assignment problem can be solved ...

  23. Semi‐dynamic traffic assignment model with mode and route choices under

    2 SEMI-DYNAMIC TRAFFIC ASSIGNMENT MODEL WITH MODE CHOICE. In our semi-dynamic approach, a day is divided into several periods. In addition, the duration of each period is not as short as the length of the time interval for ordinary discrete-time DTA models. The semi-dynamic approach presupposes that a majority of OD flows reach their ...

  24. A Model and an Algorithm for the Dynamic Traffic Assignment Problems

    A discrete time model is presented for dynamic traffice assignment with a single destination. Congestion is treated explicitly in the flow equations. The model is a nonlinear and nonconvex mathematical programming problem. A piecewise linear version of the model, with additional assumptions on the objective function, can be solved for a global ...

  25. dynamic-traffic-assignment · GitHub Topics · GitHub

    Add this topic to your repo. To associate your repository with the dynamic-traffic-assignment topic, visit your repo's landing page and select "manage topics." GitHub is where people build software. More than 100 million people use GitHub to discover, fork, and contribute to over 420 million projects.

  26. A Random Traffic Assignment Model for Networks Based on Discrete

    We study the implementation of traffic assignment engineering in conjunction with the network stochastic model: first, we study the Bayesian algorithm theoretical model of control layer stripping in the network based on the discrete dynamic Bayesian algorithm theory and analyze the resource-sharing mechanism in different queuing rules; second ...

  27. Co-evolutionary traffic signal control using reinforcement learning for

    Numerical experiments are performed at a real-data city road network and various sizable traffic grids. As compared to state-of-the-art traffic signal control for various traffic conditions, obtained results showed that CCTPC exhibits sufficient gain of achieving road network performance and suffers from the least computational cost in all cases.