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1

A real-time adaptive traffic light control algorithm at urban intersections for smart cities

Hambli Chahrazad, Amad Mourad

Applied Computer Science

|

2026

|

Vol. 22, no. 1

20--34

EN

This paper investigates the challenges of intelligent traffic light control at urban intersections in the context of the Internet of Things. Increasing vehicle density and mobility have exacerbated traffic congestion and resulted in inefficient use of road infrastructure, particularly at intersections. In addition, the dynamic nature of traffic flow, the unpredictability of human driving behavior, and the complexity of network topologies pose significant obstacles to efficient traffic control. To address these issues, an intelligent control algorithm is proposed that exploits communication between vehicles and infrastructure, as well as between infrastructures. The algorithm incorporates an enhanced version of Dijkstra's algorithm to optimize traffic light operation and minimize vehicle waiting times by dynamically computing shortest paths based on real-time traffic data. Simulation experiments on an urban road network show that the proposed method significantly reduces delays and improves travel efficiency compared to traditional fixed-time traffic control systems. Performance evaluation based on metrics such as average vehicle delay and total travel time confirms significant improvements. In addition, the system demonstrates robustness under varying traffic loads and dynamic road conditions. Future research will focus on extending the approach to highway scenarios and integrating emergency vehicle prioritization mechanisms.

2

Urban sprawl and accessibility in downtown Lomé: mobility issues and socio-spatial inequalities

Passoli Abelim, Aholou Coffi

Transport Problems

|

2025

|

T. 20, z. 4

209--221

EN

This study analyzes the impact of urban sprawl on accessibility to downtown Lomé, with a particular focus on mobility issues and socio-spatial inequalities. By adopting a mixed-methods approach that combines field surveys and cartographic analyses, the research shows that the centralization of economic and administrative services, coupled with uncontrolled spatial expansion, exacerbates traffic congestion and limits access to essential services. The results reveal a strong dependence on individual transport modes in suburbs, reflecting the lack of effective public alternatives. The findings highlight major issues for territorial equity and the sustainability of urban mobility and emphasize the need for polycentric planning as well as targeted improvements in transport infrastructure.

3

The impact of adverse weather conditions on traffic costs, environmental pollution and the operation of intersections with traffic signals

Ostrowski Krzysztof, Budzyński Marcin

Economics and Environment

|

2024

|

No. 4

art. no. 1050

EN

Living in large cities is prone to adverse environmental impacts including air pollution. Increased vehicle traffic generates congestion as some road infrastructure such as intersections, including signalised ones, have limited capacity. When congestion exceeds capacity, vehicle queues occur and their presence increases delays and generates more harmful exhaust fumes. Travel costs also increase. Studies show that adverse weather conditions negatively affect drivers’ behaviour, who become more cautious and slower to exit intersections during the green signal. Such behaviour further reduces lane capacity, increasing congestion relative to similar level of demand flow on days with favourable weather (sunny and cloudy days, no rain). The paper will demonstrate the impact of weather conditions on lane capacity and traffic performance on signalised through lanes. Worse traffic performance on days with prolonged rainfall or snowfall contributes to increased travel costs and air pollution, as will also be demonstrated in the paper.

PL

Życie w dużych miastach narażone jest na niekorzystne oddziaływania środowiskowe w tym zanieczyszczenie powietrza. Wzmożony ruch pojazdów generuje stany zatłoczenia, gdyż niektóre elementy infrastruktury drogowej takie jak skrzyżowania w tym z sygnalizacją świetlną mają ograniczoną przepustowość. Gdy natężenie przekracza przepustowość pojawiają się kolejki pojazdów, a ich obecność zwiększa straty czasu i generuje zwiększone wydzielanie się spalin, które są szkodliwe dla zdrowia. Rosną również koszty podróży. Badania wykazują, że wpływ niekorzystnych warunków pogodowych wpływa negatywnie na zachowania kierujących pojazdami, którzy ostrożniej i wolniej zjeżdżają ze skrzyżowania w czasie trwania sygnału zielonego. Takie zachowania dodatkowo zmniejszają przepustowości pasów ruchu, a tym samym zwiększają zjawisko kongestii przy podobnym poziomie natężenia dopływającego obecnego w dniach ze sprzyjającą pogodą (dni słoneczne i poch-murne, bez opadów). W artykule ukazany zostanie wpływ warunków pogodowych na przepustowość pasów ruchu oraz warunki ruchu pojazdów na pasach z relacją na wprost sterowanych sygnalizacją świetlną. Gorsze warunki ruchu w dni z długotrwałymi opadami deszczu (albo śniegu) przyczyniają się do wzrostu kosztów podróży oraz zanieczyszczeń powietrza, co zostanie wykazane w artykule.

4

Problem of the road network capacity

Celiński Ireneusz

Transport Samochodowy

|

2023

|

z. 1

16--22

EN

The perception of a typical user of the road network in a large Polish city is determined by the time he spends in queues and congestion every day. In the opinion of many users of this network, it is too long. This time ranges from several to several dozen minutes. In order to explain the dysfunction in question, the concept of physical and transportation capacity of the road network has been described. Then, the basic numerical characteristics of the Polish road network in selected small and voivodship cities have been presented. The analysis used basic data on the length of the road network, the number of inhabitants and the “motorization” indicator for the cities analysed in the article. In this context, reference was also made to commonly used ways to improve the functioning of the road network, from traffic lights, through roundabouts, to ITS (Intelligent transport systems). The summary presents, in the context of new technical solutions in the field of transport systems, the perspective of the functioning of road networks for the next 20‑30 years.

PL

Percepcja typowego użytkownika sieci drogowej w dużym polskim mieście, determinowana jest czasem, który codziennie spędza on w kolejkach i zatorach. W opinii wielu użytkowników tej sieci jest on zbyt duży. Czas ten wynosi od kilkunastu do kilkudziesięciu minut. W celu wyjaśnienia przedmiotowej dysfunkcjonalności, opisano pojęcie pojemności fizycznej i komunikacyjnej sieci drogowej. Następnie przytoczono bazowe charakterystyki liczbowe polskiej sieci drogowej w wybranych miastach powiatowych oraz wojewódzkich. W analizie wykorzystano podstawowe dane w zakresie długości sieci drogowej, liczby mieszkańców i wskaźnik motoryzacji dla miast analizowanych w artykule. W tym kontekście, odniesiono się również do powszechnie stosowanych sposobów poprawy funkcjonowania sieci drogowej poczynając od sygnalizacji świetlnej, poprzez ronda a skończywszy na systemach ITS (ang. Intelligent transport systems). W podsumowaniu zaprezentowano, w kontekście nowych rozwiązań technicznych w obszarze systemów transportowych, perspektywę funkcjonowania sieci drogowych na najbliższe 20-30 lat.

5

Token Bucket Algorithm with Modernization Techniques to avoid Congestion in DEC Protocol of WSN

Mohammad Habibulla, Krishna K. Phani Rama, Gangadhar Ch, Mohammed Riazuddin

International Journal of Electronics and Telecommunications

|

2023

|

Vol. 69, No. 3

507--513

EN

A wireless sensor system is an essential aspect in many fields. It consists of a great deal of sensor nodes. These sensor networks carry out a number of tasks, including interaction, distribution, recognition, and power supply. Data is transmitted from source to destination and plays an important role. Congestion may occur during data transmission from one node to another and also at cluster head locations. Congestion will arise as a result of either traffic division or resource allocation. Energy will be wasted due to traffic division congestion, which causes packet loss and retransmission of removed packets. As a result, it must be simplified; hence there are a few Wireless sensor networks with various protocols that will handle Congestion Control. The Deterministic Energy Efficient Clustering (DEC) protocol, which is fully based on residual energy and the token bucket method, is being investigated as a way to increase the energy efficiency. In the event of congestion, our proposal provides a way to cope with it and solves it using this method to improve lifespan of the sensor networks. Experiments in simulation show that the proposed strategy can significantly enhance lifetime, energy, throughput, and packet loss.

6

Exact wirelength of embedding 3-ary n-cubes into certain cylinders and trees

Rajeshwari S., Rajesh M.

Fundamenta Informaticae

|

2023

|

Vol. 188, nr 4

269--284

EN

Graph embeddings play a significant role in the design and analysis of parallel algorithms. It is a mapping of the topological structure of a guest graph G into a host graph H, which is represented as a one-to-one mapping from the vertex set of the guest graph to the vertex set of the host graph. In multiprocessing systems the interconnection networks enhance the efficient communication between the components in the system. Obtaining minimum wirelength in embedding problems is significant in the designing of network and simulating one architecture by another. In this paper, we determine the wirelength of embedding 3-ary n-cubes into cylinders and certain trees.

7

Towards a better understanding of the reasons for the extensive use of private cars: a case study in Skikda, Algeria

Djekrif Fatma Zohra, Bouyaya Linda, Chaib Rachid

Transport Problems

|

2022

|

T. 17, z. 4

103--114

EN

With the continuous urban expansion of cities around the world, cities have become more crowded as the numbers of all kinds of vehicles have increased, especially due to the inclination of individuals to use personal cars. In this study, we want to identify the different reasons that motivate the populations of the state of Skikda, Algeria, to prefer using cars through a questionnaire. In order to be clearer, we processed and analyzed the survey data using the SPSS analytical program. This article aims to identify the main reasons that motivate individuals to prefer using a personal car when traveling and propose possible solutions, or even identify actions to be taken now and in the future in order to establish a more sustainable exclusive transport. By analyzing the results, it became clear to us that road users prefer cars only for psychological and technical reasons and do not consider the preservation of the environment or the security of people. Although they are aware of the problems arising from their extensive use, they continue to do so because they have no other alternative. Improvements in public transportation means would change the situation.

8

Intensywność obciążenia mostów drogowych w sytuacji zatoru

Machelski Czesław

Przegląd Komunikacyjny

|

2022

|

R. 77, nr 1

4--11

PL

W pracy analizowano bezpieczeństwo mostów drogowych w trakcie ich eksploatacji w sytuacji maksymalnego obciążenia. Takie obciążenia mostów występują podczas badań odbiorczych obiektu gdy programowany jest układ samochodów na jezdni. Rozpatrywaną w pracy jest sytuacja pełnego obciążenia mostów występująca w trakcie zatoru drogowego. Wówczas układ pojazdów jest z natury rzeczy losowy a kilka z nich może tworzyć układ maksymalnego, lokalnego obciążenia. Rezultaty pomiarów podczas rzeczywistego zatoru powstałego na moście o schemacie podwieszonym odniesiono do wyników analiz numerycznych. Przyjęto dwubelkowy model przęsła i dwujezdniowy układu obciążenia w zatorze. Jako przypadek skrajny rozpatrzono w pracy obciążenie od dwóch pojazdów ale w małym moście. Do analiz porównawczych wykorzystano algorytm obciążenia zastępczego.

EN

The work analyzed the safety of road bridges during their exploitation in the situation of maximum load. Such bridge loads occur during acceptance tests of the object when the system of cars on the roadway is programmed. Considered in the work is the situation of full load on bridges occurring during a road congestion. Then the layout of the vehicles is inherently random and several of them can form a system of maximum, local load. The results of measurements during the actual congestion created on the bridge with a suspended diagram were related to the results of numerical analyzes. A two-beam span model and a dual carriageway load system in the congestion were adopted. As an extreme case, the load from two vehicles was considered at work, but in a small bridge. A replacement load algorithm was used for comparative analysis.

9

Analysis of the influence of expressway emergencies on transmission speeds and travel delays

Shi Xianfu, Liu Xingliang, Li Menghui, Liu Tangzhi

Archives of Transport

|

2022

|

Vol. 63, iss. 3

7--21

EN

Expressway emergencies tend to cause traffic congestion, and understanding the travel time delays of on-road vehicles under different combinations of event scenarios and road traffic conditions is valuable for guiding the accurate emergency dispatch services. Most existing studies used methods that combine the Lighthill-Whitham-Richards (LWR) theory and basic traffic diagrams to solve this problem, but the discrete traffic flow characteristics caused by the presence of heavy vehicles have not been considered, thus affecting the applicability of those results to road traffic characteristics in China. Moreover, there is a lack of systematic research on multiple combinations of unexpected event scenarios and traffic conditions, and the guidance value of the previously obtained results is limited. In order to improve the applicability of the prediction model and accurately predict the severity of emergencies, based on a logistic model that is applicable to emergencies, a velocity–density model is constructed to describe discrete traffic flow characteristics. Based on LWR theory, the internal driving force of expressway traffic state evolution under emergency conditions is explored. Combined with real-time traffic flow data, the parameters of the logistic model are calibrated, and a logistic velocity-density model is constructed using a goodness-of-fit test and a marching method, including the free-flow velocity, turning density and heavy vehicle mixing ratio. Thus, the problem that existing models lack applicability to road traffic characteristics in China is solved. Travel time delay is associated with the impact range of an emergency, and it is an effective index for evaluating the severity of emergency incidents. Thus, the travel time delays under different scenarios, different numbers of blocked lanes and different orthogonal combinations of approximate saturation conditions are explored, and the impacts of lane blockage on emergency incidents and travel time delays are obtained. The conclusions show that the presented logistic velocity-density model constructed based on discrete traffic flow characteristics can properly quantify the impact of the presence of heavy vehicles. Additionally, the results can provide theoretical support for handling emergencies and emergency rescues.

10

Detecting congestion in DEA by solving one model

Shadab Maryam, Saati Saber, Farzipoor Saen Reza, Khoveyni Mohammad, Mostafaee Amin

Operations Research and Decisions

|

2021

|

Vol. 31, No. 1

77--96

EN

The presence of input congestion is one of the key issues that result in lower efficiency and performance in decision-making units (DMUs). So, determination of congestion is of prime importance, and removing it improves the performance of DMUs. One of the most appropriate methods for detecting congestion is Data Envelopment Analysis (DEA). Since the output of inefficient units can be increased by keeping the input constant through projecting on the weak efficiency frontier, it is unnecessary to determine the congested inefficient DMUs. Therefore, in this case, we solely determine congested vertex units. Towards this aim, only one LP model in DEA is proposed and the status of congestion (strong congestion and weak congestion) obtained. In our method, a vertex unit under evaluation is eliminated from the production technology, and then, if there exists an activity that belongs to the production technology with lower inputs and higher outputs compared with the omitted unit, we say vertex unit evidences congestion. One of the features of our model is that by solving only one LP model and with easier and fewer calculations compared to other methods, congested units can be identified. Data set obtained from Japanese chain stores for a period of 27 years is used to demonstrate the applicability of the proposed model and the results are compared with some previous methods.

11

Performance Evaluation of the Threshold Call Admission Policy in Multi-rate Loss Systems

Moscholios Ioannis D., Chousainov Iskanter-Alexandros, Panagoulias Panagiotis I., Sarigiannidis Panagiotis G., Logothetis Michael D.

Journal of Telecommunications and Information Technology

|

2020

|

nr 2

51--60

EN

In this paper we consider a link, characterized by speciﬁc capacity, that services multi-rate random or quasirandom traﬃc. Random traﬃc is generated by an inﬁnite number of traﬃc sources, while quasi-random traﬃc is generated by a ﬁnite population of traﬃc sources. The link is modeled as a multi-rate loss system. Handover and new calls are distinguished. New calls compete for the available bandwidth under a threshold call admission policy. In that policy, a new call of a particular service-class is not allowed to enter the system if the in-service handover and new calls of the same service-class plus the new call, exceed a predeﬁned threshold (which can be diﬀerent for each service-class). On the other hand, handover calls compete for the available bandwidth based on the complete sharing policy. We show that the steady state probabilities in the proposed models have a product form solution (PFS). The PFS leads to a convolution algorithm for accurate calculation of congestion probabilities and link utilization.

12

Routing policy validation for the integrated system supporting routing in Software Deﬁned Networks (SDNRoute)

Jaglarz Piotr, Rzym Grzegorz, Jurkiewicz Piotr, Boryło Piotr, Chołda Piotr

International Journal of Electronics and Telecommunications

|

2020

|

Vol. 66, No. 1

77--83

EN

In the article, a validation module, being a component of an integrated system supporting routing in software deﬁned networks (SDNRoute), is proposed and thoroughly examined. The module allows for the veriﬁcation of the results provided by the optimization module before these results are deployed in the production network. Routing policies are validated for their impact on the network quality parameters and against the threat of overloading (congestion).

13

Performance metrics in OFDM wireless networks supporting quasi-random traffic

Panagoulias P., Moscholios I., Sarigiannidis P., Piechowiak M., Logothetis M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2020

|

Vol. 68, nr 2

215--223

EN

We consider the downlink of an orthogonal frequency division multiplexing (OFDM) based cell that accommodates calls from different service-classes with different resource requirements. We assume that calls arrive in the cell according to a quasi-random process, i.e., calls are generated by a finite number of sources. To calculate the most important performance metrics in this OFDM-based cell, i.e., congestion probabilities and resource utilization, we model it as a multirate loss model, show that the steady-state probabilities have a product form solution (PFS) and propose recursive formulas which reduce the complexity of the calculations. In addition, we study the bandwidth reservation (BR) policy which can be used in order to reserve subcarriers in favor of calls with high subcarrier requirements. The existence of the BR policy destroys the PFS of the steady-state probabilities. However, it is shown that there are recursive formulas for the determination of the various performance measures. The accuracy of the proposed formulas is verified via simulation and found to be satisfactory.

14

Wzrost znaczenia komunikacji publicznej wobec ograniczeń wjazdu do centrum miasta

Grabiński Sebastian

Builder

|

2020

|

R.24, nr 11

28--31

PL

Zatłoczenie miast jest jednym z największych problemów obecnej polityki transportowej. Odpowiednie jej kształtowanie pozwoli ograniczyć zjawisko zatłoczenia, czyli kongestii. Często możemy obserwować prace związanie z dobudowaniem pasów ruchu czy powstaniem nowych ulic. Czy jednak taki stan rzeczy prowadzi do polepszenia szybkości przemieszczania się do wyznaczonego celu, szczególnie w tak zwanych godzinach szczytu? Otóż okazuje się, że nie. Posługując się takim rozumowaniem, miasto nie staje się przyjazne ludziom, lecz samochodom. Warto więc skorzystać z rozwiązań już sprawdzonych.

EN

City congestion is one of the biggest problems in today's transport policy. Its appropriate shaping will allow to limit the phenomenon of congestion. We can often observe work related to the addition of lanes or creation of new streets. However, does such a state of affairs lead to the improvement of the speed of movement to the designated destination, especially during the so-called rush hours? Well, it turns out not. Using this reasoning, the city does not become friendly to people, but to cars. So let's use the already proven solutions.

15

Multiobjective Improved Particle Swarm Optimisation for Transmission Congestion and Voltage Profile Management using Multilevel UPFC

Rao Mallavolu Malleswara, Ramadas Geetha

Power Electronics and Drives

|

2019

|

Vol. 4 (39)

79--93

EN

This paper proposes a multiobjective improved particle swarm optimisation (IPSO) for placing and sizing the series modular multilevel converter-based unified power flow controller (MMC-UPFC) FACTS devices to manage the transmission congestion and voltage profile in deregulated electricity markets. The proposed multiobjective IPSO algorithm is perfect for accomplishing the close ideal distributed generation (DG) sizes while conveying smooth assembly qualities contrasted with another existing algorithm. It tends to be reasoned that voltage profile and genuine power misfortunes have generous upgrades along ideal speculation on DGs in both the test frameworks. The proposed system eliminates the congestion and the power system can be easily used to solve complex and non-linear optimisation problems in a real-time manner.

16

Content of Calcium, Magnesium, Sodium and Potassium in the Street Dust from the Area of Białystok (Poland)

Skorbiłowicz Mirosław, Skorbiłowicz Elżbieta

Journal of Ecological Engineering

|

2019

|

Vol. 20, nr 10

125--131

EN

The aim of the study was to assess the content of Ca, Mg, Na and K in the road dust collected in Białystok from various environments (roads with high traffic intensity, housing estate roads, roads located near parks and green areas), in order to determine the impact of the road transport on the spatial differentiation of the content of the tested components in street dust and identify their main sources. In total, the samples from 69 points were analyzed, which were taken in spring 2018 (late April and May) during the dry weather. The content of Ca, Mg, Na and K was determined by means of atomic absorption spectrometry (AAS). The average contents of the tested elements in the dust from all measuring points were in the following order: Ca (23.53%) > Mg (2.38) > Na (1.16) > K (0.25). This shows that Ca is the most numerous element in the tested dusts. Studies have not shown a significant impact of vehicle traffic, in particular the so-called non-exhaust sources related to this traffic on the content of main elements in the Białystok road dusts. The analyses have indicated that the main source of Ca and Mg in the Białystok road dust constitute the structural elements of roads, bridges and structures, in which building cement and its derivatives are the main component.

17

Public transportation and electromobility in Polish and community laws

Miśkiewicz R.

Problemy Transportu i Logistyki

|

2018

|

nr 4 (44)

63--71

EN

The economic development of Poland depends on a modern, effective and safe transport system. It is dependent on proper legal regulations both Polish and EU. They give an opportunity to develop innovative urban logistics or electromobility. The aim of the article is to analyze EU and Polish legal regulations regarding innovative public transport, as well as to present development prospects for electromobility.

PL

Rozwój gospodarczy Polski zależy od nowoczesnego, efektywnego i bezpiecznego systemu transportu. Uzależniony on jest od właściwych regulacji prawnych zarówno polskich, jak i unijnych. Dają one szansę na rozwój innowacyjnej logistyki miejskiej czy elektromobilności. Celem artykułu jest analiza unijnych i polskich regulacji prawnych dotyczących innowacyjnego transportu publicznego, a także przedstawienie perspektyw rozwojowych elektromobilności.

18

Znaczenie inteligentnych systemów transportowych

Choińska D., Puzan K.

Logistyka

|

2018

|

nr 6

51--55

PL

W pracy przedstawione zostało znaczenie inteligentnych systemów transportowych w różnych środowiskach i przykłady ich użycia. Zastosowano metody badawcze takie, jak studium literatury, case study, analiza desk research, obserwacje, wywiad oraz ankieta. Wprowadzenie ITS wpływa pozytywnie na transport drogowy. Zauważyć to można na przykładzie miasta Białystok – prekursora wdrażania nowoczesnych systemów w Polsce. Wypracowane zostały oszczędności, wzrósł stopień bezpieczeństwa i osiągnięto niższy poziom kongestii. W artykule przedstawiono również sytuację firm transportowych i ich zdanie na temat rozwiązań użytych na drogach. Polscy przedsiębiorcy w dalszym ciągu korzystają z tradycyjnych metod kontaktu między pracownikami. Wprowadzenie inteligentnych systemów transportowych, pomimo konieczności inwestycji na etapie wdrażania, przynosi oszczędności i daje długofalowe efekty.

EN

The paper presents the importance of intelligent transport systems in different environments and examples of their use. Research methods were applied, i.e. literature study, case study, desk research analysis, observations, interview and questionnaire. The introduction of ITS has a positive impact on road transport. This can be noticed on the example of the city of Białystok – a precursor of the implementation of modern systems in Poland. Savings have been achieved, the level of safety has increased and a lower level of congestion has been achieved. The article also presents the situation of transport companies and their opinion on the solutions used on the roads. Polish entrepreneurs continue to use traditional methods of contact between employees. The introduction of intelligent transport systems, despite the need to invest at the implementation stage, brings savings and long- -term effects.

19

Transport miejski w dobie inteligentnych miast

Surma A., Walnicka M.

Journal of TransLogistics

|

2018

|

Vol. 4, nr 1

79--89

PL

Celem artykułu jest przedstawienie głównych problemów transportu miejskiego, z którymi borykają się mieszkańcy współczesnych metropolii. Rosnące niezadowolenie społeczeństwa, niska przepustowość miejskich układów drogowych oraz zwiększający się poziom zanieczyszczenia powietrza - to tylko wybrane niedogodności ograniczające rozwój obszarów zurbanizowanych. Naprzeciw tym problemom wychodzi idea Smart City, dążąca do usprawnienia i rozwoju branży TSL. W referacie przedstawiono innowacyjne technologie, poprawiające jakość życia ludności oraz ułatwiające kreowanie przestrzeni miejskiej.

EN

The aim of the article is to present the main problems related to urban transport faced by the in habitants of modern metropolitan areas. Increasing dissatisfaction of the society, low capacity of urban road systems and increasing level of air pollution - these are just some of the disadvantages that limit the development of urbanized areas. Here comes the idea of Smart City, striving to improve and develop the TFL sector. This paper presents innovative technologies that can improve the quality of life of people and facilitate the creation of urban space.

20

Port congestion determinants and impacts on logistics and supply chain network of five African ports

Nze I. C., Onyemechi C.

Journal of Sustainable Development of Transport and Logistics

|

2018

|

Vol. 3, No. 1

70--82

EN

This paper typically applied the concept of ranking by inspection using the dwell time of ships in five African ports to evaluate the variations in ship turnaround time and relative efficiency level. This is to identify the active factors that cause port congestion in African ports. The results provided some explanations on the consequences arising from these on notable African logistics and supply chain networks. The findings reveal that the bane of congestion in African ports emanates entirely from either planning, regulation, capacity, efficiency or a combination of these. The regression analysis with IBM SPSS v20 reveals that there is a significant relationship between cargo throughput and other port performance indicators in Nigeria for the study period (2005 - 2014). More so, the t-test reveals that there is a significant relationship between cargo throughput and berth occupancy rate which is significantly indicative of port congestion. This paper therefore recommends that African ports should enhance their regulatory mechanisms, and also improve capacity and efficiency level in order to shoulder the ever increasing challenges of port congestion in years ahead.