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1

Its-pro-flow: a new enhanced short-term traffic flow prediction for intelligent transportation systems

Kozici Halil Ibrahim, Kosunalp Selahattin, Arucu Muhammet

Zeszyty Naukowe. Transport / Politechnika Śląska

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2023

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z. 120

117--136

EN

Short-term traffic flow prediction plays a significant role in various applications of intelligent transportation systems (ITS), such as road traffic control and route guidance. This requires the development of intelligent prediction approaches for accurate and timely traffic flow information. To handle this issue, this paper emphasizes the potential of a new idea to propose a high-quality and intelligent prediction of short-term traffic flow in ITS. The proposed model, referred to as ITS-Pro-Flow, takes the benefits of the well-known Profile-Energy (Pro-Energy) as a landmark solution, relying on past observations and current conditions to forecast future short-term traffic flow volume. ITS-Pro-Flow has an effective prediction mechanism due to its unique enhancements over Pro-Energy. The distinctive feature of ITS-Pro-Flow is that it dynamically adjusts the contributions of past predictions and current observations for a particular prediction, which is equally performed in Pro-Energy. We prove the performance of ITS-Pro-Flow through extensive simulations with 2 datasets, in comparison to Pro-Energy and IPro-Energy. Performance results clearly indicate that ITS-Pro-Flow provides more accurate predictions than other schemes.

2

On site processing of video stream for mapping traffic parameters

Pamuła Wiesław, Kłos Marcin Jacek

Zeszyty Naukowe. Transport / Politechnika Śląska

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2022

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z. 117

175--189

EN

Traffic surveillance provides crucial data for the operation of intelligent transportation systems. The growing number of cameras in the transport system poses a problem for the efficient processing of surveillance data. Processing of video data for extracting traffic parameters is usually done using image processing methods and requires substantial processing resources. An alternative way is to transform the video stream and map the traffic parameters using the obtained transform coefficients. Spatiotemporal wavelet transform of the video stream contents, using filter banks, is proposed for mapping traffic parameters. Performed tests prove good resilience to illumination changes of road scenes. Mapping errors are smaller than in the case of the commonly used video detectors at sites on multilane roads with low to moderate traffic load.

3

Saturated arterial coordinate control strategy optimization considering macroscopic fundamental diagram

Lin Xuanhua, Lin Xiaohui, Chen Kelian

Archives of Transport

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2022

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Vol. 62, iss. 2

73--90

EN

MFD is widely used in traffic state evaluation because of its description of the macro level of urban road network. Aiming at the control strategy optimization problem of urban arterial road network under saturated traffic flow state, this study analyzes the MFD characteristics of a typical three-segment "ascending-stable-descending segment" and its advantages in characterizing the macroscopic operation efficiency of the road network, a arterial coordination control strategy considering MFD is proposed. According to the characteristics of MFD, it is proposed that the slope of the ascending segment and the capacity of the road network represent the operating efficiency of the free flow and saturated flow of the road network respectively. The traffic flow and density data of road segment are obtained by the road detector through Vissim simulation software. Aiming at the problem that the MFD is too discrete due to unreasonable control strategy or traffic condition, and in order to extract the MFD optimization target indicators, it is proposed to extract the key boundary points of the MFD by the “tic-tac-toe” method and divide the MFD state by Gaussian mixture clustering. The genetic algorithm integrates the multi-objective particle swarm algorithm as the solution algorithm, and the simulation iterative process is completed through Python programming and the com interface of Vissim software. In order to verify the validity of the model and algorithm, the actual three-intersections arterial road network is used for verification, and the model in this study is compared with the optimization model without considering MFD, the model solved by traditional algebraic method, and the optimization model solved by typical multi-objective particle swarm. Results show that the model in this research performs well in efficiency indicators such as total delay, average delay, and queue coefficient. At the same time, the MFD form has highest stability, the control effect is the best in the saturated state. The solution algorithm GA-MOPSO also has a better solution effect.

4

Performance analysis of LSTM model with multi-step ahead strategies for a short-term traffic flow prediction

Doğan Erdem

Zeszyty Naukowe. Transport / Politechnika Śląska

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2021

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z. 111

15--31

EN

In this study, the effect of direct and recursive multi-step forecasting strategies on the short-term traffic flow forecast performance of the Long Short-Term Memory (LSTM) model is investigated. To increase the reliability of the results, analyses are carried out with various traffic flow data sets. In addition, databases are clustered using the k-means++ algorithm to reduce the number of experiments. Analyses are performed for different time periods. Thus, the contribution of strategies to LSTM was examined in detail. The results of the recursive based strategy performances are not satisfactory. However, different versions of the direct strategy performed better at different time periods. This research makes an important contribution to clarifying the compatibility of LSTM and forecasting strategies. Thus, more efficient traffic flow prediction models will be developed and systems such as Intelligent Transportation System (ITS) will work more efficiently. A practical implication for researchers that forecasting strategies should be selected based on time periods.

5

Inland water transport applicability for sustainable sea port hinterland infrastructure development. Klaipeda Sea-Port case

Malkus Ričardas, Liebuvienė Jūratė, Jokubyniėnė Vida

Transport Problems

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2020

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T. 15, z. 2

25--31

EN

The aim of this paper is to present an analysis of the main factors influencing negatively Klaipeda Sea Port performance and competitiveness as well as their limiting impact on the development of this transport system entity in general. This case study research is proposing some alternative solutions decreasing negative influences of comparatively declining land transport infrastructure connectivity to the Sea Port hinterland. Analysis of hinterland connectivity is based on the extended gate concept, where a series of terminals and related logistical activities are integrated into a functional single entity. The intensity of real road transport flows on the main connecting road intersections has been evaluated using digital tools with input data from the ArcGIS platform. Also, accessibility to other terminals (at the local, regional and global scale) as well as the terminal is linkage to the regional transport system has been taken into account. One of the objectives of this research was to define objectively the state of traffic flow on the highway connecting Klaipeda sea-port to its hinterland because the road infrastructure was not qualitatively improved for a long period, while the average annual seaport turnover is constantly growing by 6% - 9%. Secondly, it was defined how substantially is possible to decrease the load of road traffic in case of reestablishing of an inland waterway connection between practically the same points of the transport route. Using mathematical modeling of traffic flows is proved that, road transport highway connection in/from the Klaipeda Seaport is loaded substantially and requires systemic improvement (building at least additional lanes in both directions, etc.) to promote further growth of Klaipeda sea-port capacities. The option to apply an additional inland waterway connection allows to decrease the road traffic flow up to 9 – 11% with the possible development of this option, what in its’ turn also decrease the negative influence on the environment.

6

Use of information bases for the application of operational aviation regulations

Šála J., Němec V., Novák A.

Archives of Transport System Telematics

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2013

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Vol. 6, iss. 4

42--45

EN

Text of the article describes the application of information bases as a tool for safety in air transport. By converting these rules into the base allows easier and quicker orientation in regulatory requirements. The following paragraphs provide information about the whole concept and demonstrate key concepts needed to understand the software.

7

Projekt akomodacyjnej sygnalizacji świetlnej dla skrzyżowania rondo Starołęka w Poznaniu

Piątkowski B., Maciejewski M.

Logistyka

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2011

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nr 6

PL

Celem artykułu jest przedstawienie procesu projektowania sterownika akomodacyjnego sygnalizacji świetlnej dla skrzyżowania Rondo Starołęka w Poznaniu. Prace polegały na sprawdzeniu istniejącego rozwiązania sterowania ruchem na skrzyżowaniu, a następnie stworzeniu autorskiej sygnalizacji akomodacyjnej w tym: odpowiednich faz oraz algorytmu sterowania sygnalizacją. Zaproponowane rozwiązanie porównano z istniejącym za pomocą mikrosymulacji ruchu drogowego wykorzystując system VISSIM. Po wykonaniu wirtualnego modelu skrzyżowania, przeprowadzeniu symulacji i analizie wyników, stwierdzono, że nowo zaprojektowana akomodacyjna sygnalizacja świetlna wpłynęła na polepszenie się warunków ruchu na skrzyżowaniu oraz znacząco skróciło kolejkę pojazdów na jednym z wlotów.

EN

The aim of this paper is to present the process of designing an actuated traffic lights controller for Rondo Starołęka roundabout in Poznan. The first task was to analyze the existing solution to the traffic light control and then to design the actuated traffic lights, including phases and a control strategy. The proposed solution was compared to the existing one by means of VISSIM, a microscopic traffic flow simulation system. After creating a virtual model of the roundabout, carrying out simulations and analyzing the results, the new actuated traffic lights were found to improve traffic conditions at the intersection and to significantly reduce a queue of vehicles at one of the inlets.

8

Znaczenie i źródło kongestii transportowej na przykładzie białostockiej aglomeracji miejskiej

Wappa P., Halicka K.

Ekonomia i Zarządzanie

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2011

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Vol. 3, no. 4

63-75

EN

The development of industrialization in the 20th century that resulted in the conversion of agricultural land in the industrial societies and migration of rural population to urban areas, started the process of urbanization in the world. The changes resulted in infrastructure transformations and determined the shape and functioning of the centers of modern life. Present continually increasing urban growth, complicates the free movement of goods and cargo flows in cities. It affects their dysfunctional nature, generating phenomenon in the form of transport congestion. The aim of research is the approximation of this problem. The study will be done on the example of the transportation system condition in the urban area of Białystok.

9

Second order traffic flow modelIing: Riemann problem resolution in the homogeneous case and applications to traffic timulation

Mammar S., Lebacque J.-P. J.-P., Salem H. H.

Archives of Transport

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2008

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Vol. 20, iss. 1-2

87-111

EN

This paper presents theoretical discussions, improvement and complete resolution, in the homogenous case, of the recent second order macroscopic model developments suggested by Aw and Rascle, and Zhang, respectively. The improved model strictly respects the anisotropic character of traffic flow. The resolution of the Riemann problem is described analytically and numerically. Non trivial examples are solved completely, which can be applied to the wave-tracking discretisation of the model. Numerical simulation results are reported.

PL

Artykuł przedstawia rozważania teoretyczne, udoskonalenie i pełne rozwiązanie najnowszego modelu makroskopowego drugiego rzędu sformułowanego przez Awa i Rascle'a oraz Zhanga dla przypadku jednorodnego. Ulepszony model dokładnie odzwierciedla anizotropowy charakter przepływu ruchu. Rozwiązanie problemu Riemanna jest przedstawione analitycznie i numerycznie. Nietrywialny przykład zostałw pełni rozwiązany i może być zastosowany do śledzącej falę dyskretyzacji modelu. Przedstawiono wyniki symulacji numerycznej.

10

Przegląd i porównanie makroskopowych modeli przepływu ruchu

Maciejewski M., Walerjańczyk W.

Prace Naukowe Politechniki Warszawskiej. Transport

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2007

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z. 62

191-199

PL

Celem artykułu jest udzielenie wsparcia przy wyborze modelu ruchu, z zakresu klasy modeli makroskopowych, poprzez prezentacje podstaw teoretycznych poszczególnych modeli oraz zwięzłe omówienie stosowanych metod dyskretyzacji wyjściowego zagadnienia ciągłego. Na tej podstawie dokonano zwięzłego przeglądu opracowań numerycznych, czyli krótką charakterystykę dostepnego na rynku oprogramowania. Całość prezentacji zamknięto porównaniami wybranych modeli i programów oraz wypływającymi z tego tytułu konkluzjami.

EN

This paper presents an evaluation of the existing macroscopic traffic flow models to identify the models that can be potentially applied in certain traffic analyses. Some introductory theories of macroscopic flow models along with solution methods are then presented. It is concluded that presently macroscopic models appear to have the highest probability of success in specific large scale problems where fast evolving microscopic methods are not appilicable due computational efficiency or parameterization difficulty.