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Dr. Ioannis Politis
Assistant Professor

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0 Transportation
0 Transportation Demand Management
0 Transportation Engineering
0 mobility and transport
0 traffic psychology

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Journal article
Published: 02 August 2021 in Future Transportation
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The transportation network design and frequency setting problem concerns the optimization of transportation systems comprising fleets of vehicles serving a set amount of passengers on a predetermined network (e.g., public transport systems). It has been a persistent focus of the transportation planning community while, its NP-hard nature continues to present obstacles in designing efficient, all-encompassing solutions. In this paper, we present a new approach based on an alternating-objective genetic algorithm that aims to find Pareto optimality between user and operator costs. Extensive computational experiments are performed on Mandl’s benchmark test and prove that the results generated by our algorithm are 5–6% improved in comparison to previously published results for Pareto optimality objectives both in regard to user and operator costs. At the same time, the methods presented are computationally inexpensive and easily run on office equipment, thus minimizing the need for expensive server infrastructure and costs. Additionally, we identify a wide variance in the way that similar computational results are reported and, propose a novel way of reporting benchmark results that facilitates comparisons between methods and enables a taxonomy of heuristic approaches to be created. Thus, this paper aims to provide an efficient, easily applicable method for finding Pareto optimality in transportation networks while highlighting specific limitations of existing research both in regards to the methods used and the way they are communicated.

ACS Style

Theocharis Vlachopanagiotis; Konstandinos Grizos; Georgios Georgiadis; Ioannis Politis. Public Transportation Network Design and Frequency Setting: Pareto Optimality through Alternating-Objective Genetic Algorithms. Future Transportation 2021, 1, 248 -267.

AMA Style

Theocharis Vlachopanagiotis, Konstandinos Grizos, Georgios Georgiadis, Ioannis Politis. Public Transportation Network Design and Frequency Setting: Pareto Optimality through Alternating-Objective Genetic Algorithms. Future Transportation. 2021; 1 (2):248-267.

Chicago/Turabian Style

Theocharis Vlachopanagiotis; Konstandinos Grizos; Georgios Georgiadis; Ioannis Politis. 2021. "Public Transportation Network Design and Frequency Setting: Pareto Optimality through Alternating-Objective Genetic Algorithms." Future Transportation 1, no. 2: 248-267.

Journal article
Published: 06 May 2021 in Future Transportation
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In this paper, we explore lifetime private mobility milestones in Greece and identify the factors that affect them, to explore the everchanging mobility landscape. In total, five archetypal private mobility milestones were examined: the age of getting a car driving license and the period until getting a car following that; the age of getting a motorbike driving license; the age of getting a first bicycle as an adult; and the age of first traveling by airplane. To this end, duration modeling and namely Kaplan-Meier and Cox Proportional Hazards models were developed. Results show that mobility paradigms are evolving and are affected by a wide array of factors. Generational differences are particularly highlighted, as younger travelers are less likely to get a car driving license or a car sooner but are more likely to get a bicycle as adults. Higher parents’ income diversely affects multiple mobility milestones. Growing up in rural locations and sustainable transport awareness also significantly affect mode choice related mobility milestones. Men were more likely to get both car and motorbike driving licenses at younger ages. The above results highlight the mobility profiles of Greek citizens and the factors that affect them, while offering insights into a future mobility landscape.

ACS Style

Ioannis Fyrogenis; Ioannis Politis. Exploring Generational Private Mobility Paradigm Shifts through Duration Modeling Analytics: A Greek Case Study. Future Transportation 2021, 1, 54 -81.

AMA Style

Ioannis Fyrogenis, Ioannis Politis. Exploring Generational Private Mobility Paradigm Shifts through Duration Modeling Analytics: A Greek Case Study. Future Transportation. 2021; 1 (1):54-81.

Chicago/Turabian Style

Ioannis Fyrogenis; Ioannis Politis. 2021. "Exploring Generational Private Mobility Paradigm Shifts through Duration Modeling Analytics: A Greek Case Study." Future Transportation 1, no. 1: 54-81.

Journal article
Published: 01 May 2021 in Research in Transportation Economics
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In this paper, we investigate the performance of a bus lane that is (de)activated under specific road traffic and public transport conditions. More specific, the VISSIM microscopic simulation software along with VisVAP and EnViVer add-on modules were employed to represent the operation of a bus lane with intermittent use by cars in a highly congested arterial. We modelled various scenarios to determine the level of traffic volumes and bus service frequencies for which such bus lane concept would be effective. Empirical findings showed that when peak hour volumes range between 1000 and 2000 vehicles, the mixing of cars and buses on bus lanes may lead to a) serious reductions of vehicles’ queue lengths, b) significant decreases of greenhouse gas and air pollutant emissions derived from traffic flow and speed profile improvements and c) financial viability of the experiment. The joint use of bus lanes at 2000 vehicles per peak hour was highlighted as the most financially viable scenario. On the other hand, delays were comparatively increased due to the lower speed of cars which were moving onto the bus lane. Finally, our bus lane concept was not performed well under bus headways shorter than 2 min.

ACS Style

Aikaterini Kampouri; Ioannis Politis; Georgios Georgiadis. A system-optimum approach for bus lanes dynamically activated by road traffic. Research in Transportation Economics 2021, 101075 .

AMA Style

Aikaterini Kampouri, Ioannis Politis, Georgios Georgiadis. A system-optimum approach for bus lanes dynamically activated by road traffic. Research in Transportation Economics. 2021; ():101075.

Chicago/Turabian Style

Aikaterini Kampouri; Ioannis Politis; Georgios Georgiadis. 2021. "A system-optimum approach for bus lanes dynamically activated by road traffic." Research in Transportation Economics , no. : 101075.

Journal article
Published: 17 March 2021 in European Transport Research Review
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Background COVID-19 pandemic is a challenge that the world had never encountered in the last 100 years. In order to mitigate its negative effects, governments worldwide took action by prohibiting at first certain activities and in some cases by a countrywide lockdown. Greece was among the countries that were struck by the pandemic. Governmental authorities took action in limiting the spread of the pandemic through a series of countermeasures, which built up to a countrywide lockdown that lasted 42 days. Methodology This research aims at identifying the effect of certain socioeconomic factors on the travel behaviour of Greek citizens and at investigating whether any social groups were comparatively less privileged or suffered more from the lockdown. To this end, a dynamic online questionnaire survey on mobility characteristics was designed and distributed to Greek citizens during the lockdown period, which resulted in 1,259 valid responses. Collected data were analysed through descriptive and inferential statistical tests, in order to identify mobility patterns and correlations with certain socioeconomic characteristics. Additionally, a Generalised Linear Model (GLM) was developed in order to examine the potential influence of socioeconomic characteristics to trip frequency before and during the lockdown period. Results Outcomes indicate a decisive decrease in trip frequencies due to the lockdown. Furthermore, the model’s results indicate significant correlations between gender, income and trip frequencies during the lockdown, something that is not evident in the pre-pandemic era.

ACS Style

Ioannis Politis; Georgios Georgiadis; Anastasia Nikolaidou; Aristomenis Kopsacheilis; Ioannis Fyrogenis; Alexandros Sdoukopoulos; Eleni Verani; Efthymis Papadopoulos. Mapping travel behavior changes during the COVID-19 lock-down: a socioeconomic analysis in Greece. European Transport Research Review 2021, 13, 1 -19.

AMA Style

Ioannis Politis, Georgios Georgiadis, Anastasia Nikolaidou, Aristomenis Kopsacheilis, Ioannis Fyrogenis, Alexandros Sdoukopoulos, Eleni Verani, Efthymis Papadopoulos. Mapping travel behavior changes during the COVID-19 lock-down: a socioeconomic analysis in Greece. European Transport Research Review. 2021; 13 (1):1-19.

Chicago/Turabian Style

Ioannis Politis; Georgios Georgiadis; Anastasia Nikolaidou; Aristomenis Kopsacheilis; Ioannis Fyrogenis; Alexandros Sdoukopoulos; Eleni Verani; Efthymis Papadopoulos. 2021. "Mapping travel behavior changes during the COVID-19 lock-down: a socioeconomic analysis in Greece." European Transport Research Review 13, no. 1: 1-19.

Journal article
Published: 03 February 2021 in Safety
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Intersection safety and drivers’ behavior are strongly interrelated, especially when the latter are located in dilemma zone. This paper explores, among others, the main factors affecting driver behavior, such as distance to stop line, approaching speed and acceleration/deceleration, and two additional factors, namely, driver’s aggressiveness and driver’s relative position at the onset of the yellow signal. Field data were collected using unmanned aerial vehicle (UAV) technology. Two binary choice models were developed, the first relying on observed data and the latter enriched by the latent factor drivers’ aggressiveness and the vehicles’ relative position. Drivers were classified to aggressive and non-aggressive ones using a latent class model that combined approaching speed and acceleration/deceleration data. Drivers were further grouped according to their expected reaction/decision to stop or cross the intersection in relation to their relative position. Both models equally explain drivers’ decisions adequately, but the second one offers additional explanatory power attributed to aggressiveness. Being able to identify the level of aggressiveness among the drivers enables the calculation of the probability that drivers will cross the intersection even if caught in a dilemma zone or in a zone in which the obvious decision is to stop. Such findings can be valuable when designing a signalized intersection and the traffic time settings, as well as the posted speed limit.

ACS Style

Panagiotis Papaioannou; Efthymis Papadopoulos; Anastasia Nikolaidou; Ioannis Politis; Socrates Basbas; Eleni Kountouri. Dilemma Zone: Modeling Drivers’ Decision at Signalized Intersections against Aggressiveness and Other Factors Using UAV Technology. Safety 2021, 7, 11 .

AMA Style

Panagiotis Papaioannou, Efthymis Papadopoulos, Anastasia Nikolaidou, Ioannis Politis, Socrates Basbas, Eleni Kountouri. Dilemma Zone: Modeling Drivers’ Decision at Signalized Intersections against Aggressiveness and Other Factors Using UAV Technology. Safety. 2021; 7 (1):11.

Chicago/Turabian Style

Panagiotis Papaioannou; Efthymis Papadopoulos; Anastasia Nikolaidou; Ioannis Politis; Socrates Basbas; Eleni Kountouri. 2021. "Dilemma Zone: Modeling Drivers’ Decision at Signalized Intersections against Aggressiveness and Other Factors Using UAV Technology." Safety 7, no. 1: 11.

Journal article
Published: 17 November 2020 in Sustainability
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Electronic toll collection (ETC) plays, as part of transport demand management (TDM) measures, an important role in preventing traffic congestion and improving the environmental conditions in urban and rural areas. An attempt is made in the framework of this paper to evaluate the overall performance of a toll station when a lane is dedicated to ETC. The case study refers to a toll station in the Thessaloniki Metropolitan Area, Greece. Scenarios considered specific traffic characteristics, variable toll booth setups, and different penetration rates of the ETC tag users for car and heavy vehicles. The tool used in the evaluation process was the PTV Vissim traffic simulation software. The operation of the toll station during a specific peak-hour period was simulated with the aid of the specific software. In total, 39 alternative scenarios were developed and compared to determine the level of penetration rate for which the ETC lane would be effective for different toll booth setups. Results showed that when the right lane of the toll station is converted to ETC lane, the penetration rate of this lane must be greater the 15% for the private vehicles and 20% for the heavy goods vehicles (HGV) to reduce traffic congestion and to improve environmental conditions. It was also found that when an additional ETC lane was introduced to the existing toll station set up, traffic congestion and the associated environmental conditions were much improved even for low penetration rates. It must be noticed that the results from the use of discounted cash flow methods like internal rate of return (IRR), net present value (NPV) and benefit–cost ratio (BCR) showed that all economic indicators converge as penetration rate increases in all toll booth setups. Therefore, there is a specific penetration rate threshold above which the economic viability of the investment is secured. These findings can assist the design of an effective policy in terms of the optimized operation of a toll station and sustainable mobility planning.

ACS Style

Ioannis-Dimosthenis Ramandanis; Ioannis Politis; Socrates Basbas. Assessing the Environmental and Economic Footprint of Electronic Toll Collection Lanes: A Simulation Study. Sustainability 2020, 12, 9578 .

AMA Style

Ioannis-Dimosthenis Ramandanis, Ioannis Politis, Socrates Basbas. Assessing the Environmental and Economic Footprint of Electronic Toll Collection Lanes: A Simulation Study. Sustainability. 2020; 12 (22):9578.

Chicago/Turabian Style

Ioannis-Dimosthenis Ramandanis; Ioannis Politis; Socrates Basbas. 2020. "Assessing the Environmental and Economic Footprint of Electronic Toll Collection Lanes: A Simulation Study." Sustainability 12, no. 22: 9578.

Conference paper
Published: 04 November 2020 in Advances in Intelligent Systems and Computing
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The eve of the 2020s finds European cities in a process of shifting citizens’ mobility preferences towards more sustainable transport means. Cycling is an emerging alternative to motorised modes, particularly due to its lower operating cost and its contribution to healthier lifestyles and containment of climate deregulation from transport sector. Towards establishing cycling as a commuting mode and decreasing private car use, city authorities are increasingly investing in delivering integrated cycling route networks, pro-cycling policies and related services. However, poor and inadequate network design may act as a deterrent to cycling, due to safety, accessibility or quality concerns. To address this, the Greek Ministry of Transport in 2016 issued a set of technical guidelines for cycling network infrastructures in order to standardize their design process. In response to these new guidelines, this paper proposes a methodology for the assessment of existing cycling infrastructure through the utilization of a structured checklist. This checklist considers critical components of bicycle networks, such as their signage, width, inclinations, lighting, intersections, types of separation and interface with other modes and examines them against the minimum requirements described in national standards. The methodology was piloted in the existing cycling networks of Athens and Trikala, Greece. Results indicated certain design flaws and the attributes that did not comply with national standards. The proposed methodology could assist planning authorities into monitoring the quality of cycling infrastructure in Greek cities and indicating the aspects that do not meet the national set thresholds along with highlighting the appropriate interventions.

ACS Style

Georgios Georgiadis; Efthimios Bakogiannis; Aristomenis Kopsacheilis; Georgios Barmpas; Ioannis Politis. Assessing the Compliance of Existing Cycling Route Infrastructure Against National Guidelines in Greece. Advances in Intelligent Systems and Computing 2020, 980 -990.

AMA Style

Georgios Georgiadis, Efthimios Bakogiannis, Aristomenis Kopsacheilis, Georgios Barmpas, Ioannis Politis. Assessing the Compliance of Existing Cycling Route Infrastructure Against National Guidelines in Greece. Advances in Intelligent Systems and Computing. 2020; ():980-990.

Chicago/Turabian Style

Georgios Georgiadis; Efthimios Bakogiannis; Aristomenis Kopsacheilis; Georgios Barmpas; Ioannis Politis. 2020. "Assessing the Compliance of Existing Cycling Route Infrastructure Against National Guidelines in Greece." Advances in Intelligent Systems and Computing , no. : 980-990.

Conference paper
Published: 04 November 2020 in Advances in Intelligent Systems and Computing
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Urban areas have a primary role in the world today. Almost half of the worldwide population lives in cities, while more than 80% of the global GDP is generated in these areas. On the other hand, cities account for 80% of the energy production and over 67% of the Greenhouse Gas Emissions. In this framework, city centres are generally considered as the most critical areas in urban and transport planning, as they attract a significant share of trips, and in tandem with the complex traffic problems and challenges such as congestion, they face serious environmental issues. In an attempt to mitigate the problems mentioned above, planners promote the sustainable mobility measures and principles, including the green modes of transport and the implementation of traffic calming interventions. In this context, the current paper presents a “before and after” study focusing on the traffic calming interventions that were implemented in the centre of the city of Serres, Greece during the last years. To this end, a traffic simulation model (VISUM), as well as a Road Emissions Calculating Model (COPERT), were developed, while an analysis of traffic accidents was also conducted. Moreover, the acceptance of the interventions among the citizens was also assessed through a questionnaire survey. The results pointed out that the interventions in the centre of Serres have met with great success as the quality of the environment and life, in general, was improved significantly.

ACS Style

Alexandros Sdoukopoulos; Eleni Verani; Anastasia Nikolaidou; Ioannis Politis; Foteini Mikiki. Traffic Calming Measures as a Tool to Revitalise the Urban Environment: The Case of Serres, Greece. Advances in Intelligent Systems and Computing 2020, 770 -779.

AMA Style

Alexandros Sdoukopoulos, Eleni Verani, Anastasia Nikolaidou, Ioannis Politis, Foteini Mikiki. Traffic Calming Measures as a Tool to Revitalise the Urban Environment: The Case of Serres, Greece. Advances in Intelligent Systems and Computing. 2020; ():770-779.

Chicago/Turabian Style

Alexandros Sdoukopoulos; Eleni Verani; Anastasia Nikolaidou; Ioannis Politis; Foteini Mikiki. 2020. "Traffic Calming Measures as a Tool to Revitalise the Urban Environment: The Case of Serres, Greece." Advances in Intelligent Systems and Computing , no. : 770-779.

Conference paper
Published: 04 November 2020 in Advances in Intelligent Systems and Computing
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The bloom of computer engineering and data science unveils new potential for several business sectors, regarding the enhancement of their operational functions. Transport stakeholders can benefit from computer science advances, such as Artificial Intelligence (ΑΙ) or Data Mining (DM) techniques, which can contribute to the utilization of existing data and maximize their productive efficiency. Reduced operating costs, decreased travel times, as well as faster freight delivery times are among several gains that can be achieved through the adoption of such techniques. Analysing transport related social media content could also provide useful insight into customers’ needs and preferences based on their social media behaviour. However, the aforementioned computer science fields are relatively new and require advanced hardware as well as necessary expertise. Thus, the take – up from transport operators is not significant yet. In this paper, we provide an overview of the currently applied AI and DM techniques in corporate decision making, planning, and management practiced by various transport operators worldwide. Our literature review highlights original findings and case studies from selected freight and passenger transport operators in Greece. To further investigate their activities, a questionnaire survey was conducted to examine the existence of a systematic data collection system, the processes of data mining and analysis applied (if any) and most importantly the fields where the information derived from data analysis is exploited. Survey findings reveal the relative maturity of Greek transport operators for applying AI and DM techniques.

ACS Style

Aristomenis Kopsacheilis; Anastasia Nikolaidou; Georgios Georgiadis; Ioannis Politis; Panagiotis Papaioannou. Investigating the Prospect of Adopting Artificial Intelligence Techniques from Transport Operators in Greece. Advances in Intelligent Systems and Computing 2020, 1097 -1106.

AMA Style

Aristomenis Kopsacheilis, Anastasia Nikolaidou, Georgios Georgiadis, Ioannis Politis, Panagiotis Papaioannou. Investigating the Prospect of Adopting Artificial Intelligence Techniques from Transport Operators in Greece. Advances in Intelligent Systems and Computing. 2020; ():1097-1106.

Chicago/Turabian Style

Aristomenis Kopsacheilis; Anastasia Nikolaidou; Georgios Georgiadis; Ioannis Politis; Panagiotis Papaioannou. 2020. "Investigating the Prospect of Adopting Artificial Intelligence Techniques from Transport Operators in Greece." Advances in Intelligent Systems and Computing , no. : 1097-1106.

Conference paper
Published: 04 November 2020 in Advances in Intelligent Systems and Computing
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Currently, there has been a research focus on exploiting the information that can be extracted from social media platforms for scientific purposes. Social media data is dynamic, user-generated, and includes a combination of spatial, temporal, and textual information. Mining and analyzing transport information from social media is a relatively new field and it can be used during transportation planning and management, as well as for supporting the achievement of specific transport policy goals. In addition, social media provide public transport agencies with an unparalleled opportunity to connect with their customers. This paper explores the use of social media among public transport agencies in Europe. In this context, a relevant literature review was combined with original findings obtained from a survey on selected public transport agencies. Relevant information was derived from online sources, including blog posts, websites, online journals and publications. The survey results provided an integrated overview of the use of social media among the selected agencies. Public transport operators use social media mainly for: (a) real-time updates and information, (b) information to customers regarding services, fares, and services disruptions, (c) engaging citizens by handling complaints and inquiries, (d) employee recognition and recruitment of staff and (e) video entertainment and contests. Twitter was most commonly used for short communications and service updates, Facebook for short announcements and service updates, but also for community building and branding. Organizations employ YouTube and Instagram to build community support, whereas LinkedIn was used for networking and recruitment.

ACS Style

Georgios Georgiadis; Anastasia Nikolaidou; Ioannis Politis; Panagiotis Papaioannou. How Public Transport Could Benefit from Social Media? Evidence from European Agencies. Advances in Intelligent Systems and Computing 2020, 645 -653.

AMA Style

Georgios Georgiadis, Anastasia Nikolaidou, Ioannis Politis, Panagiotis Papaioannou. How Public Transport Could Benefit from Social Media? Evidence from European Agencies. Advances in Intelligent Systems and Computing. 2020; ():645-653.

Chicago/Turabian Style

Georgios Georgiadis; Anastasia Nikolaidou; Ioannis Politis; Panagiotis Papaioannou. 2020. "How Public Transport Could Benefit from Social Media? Evidence from European Agencies." Advances in Intelligent Systems and Computing , no. : 645-653.

Conference paper
Published: 04 November 2020 in Advances in Intelligent Systems and Computing
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In order for the bicycle usage to be increased, cities need to provide users, inter alia, with high-quality infrastructure. Yet, there is not a generally accepted approach to optimize placemaking of such infrastructure in the urban environment, especially on the micro-level. This paper presents a methodological approach for assessing alternative bicycle lane implementations in urban networks, from a micro perspective. Specifically, a multicriteria analysis-based methodology is proposed, which accounts for specific criteria, including geometric characteristics of road network (i.e. road width and slope), effect on on-street parking supply, public acceptance, land-use and built environment characteristics, etc. These criteria are weighted, in line with their relative importance, by micromobility and sustainable urban mobility experts. This methodology is applied to the city of Karditsa, Greece, where two (2) alternative streets were examined in terms of hosting a different type of bicycle lane that would complement the existing cycle route network. The MCA results suggested that safety forms the major factor that most heavily affect the final placemaking and type of the bicycle lane decision. The proposed methodology could contribute towards successful bicycle routing, forming a useful tool for traffic engineers and local authorities.

ACS Style

Ioannis Politis; Efthymis Papadopoulos; Ioannis Fyrogenis; Zoi Fytsili. A Multi-criteria-Based Methodology for Assessing Alternative Bicycle Lane Implementation Solutions in Urban Networks. Advances in Intelligent Systems and Computing 2020, 435 -444.

AMA Style

Ioannis Politis, Efthymis Papadopoulos, Ioannis Fyrogenis, Zoi Fytsili. A Multi-criteria-Based Methodology for Assessing Alternative Bicycle Lane Implementation Solutions in Urban Networks. Advances in Intelligent Systems and Computing. 2020; ():435-444.

Chicago/Turabian Style

Ioannis Politis; Efthymis Papadopoulos; Ioannis Fyrogenis; Zoi Fytsili. 2020. "A Multi-criteria-Based Methodology for Assessing Alternative Bicycle Lane Implementation Solutions in Urban Networks." Advances in Intelligent Systems and Computing , no. : 435-444.

Journal article
Published: 05 October 2020 in Sustainability
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In this paper, we explore users’ intentions to use bike-sharing systems (BSS) compared to traditional competitive transport modes—private car, bus and walking. Fueled by the increasingly rampant growth of shared economy and Information and Communication Technology (ICT), shared mobility is gaining increasing traction. The numbers of shared mobility schemes are rapidly growing worldwide and are accompanied by changes in the traditional vehicle ownership model. In order to pinpoint the factors that strongly affect the willingness to use BSS, a stated preference survey among car and bus users as well as pedestrians was designed and conducted. Binary logit models of the choice between the currently preferred transportation modes and BSSs were developed, for short and long-duration trips, respectively. The results highlight a distinctive set of factors and patterns affecting the willingness to adopt bike-sharing: choice is most sensitive to travel time and cost of the competitive travel options. In general, users are more willing to make the switch to a BSS, especially for short trip durations, when their typical mode of transport becomes more expensive. Bike-sharing also seems to be a more attractive option for certain user socio-demographic groups per mode and trip duration (age, education level, employment status, household income). Trip characteristics such as trip purpose and frequency were also found to affect the willingness to choose BSS. In general, BSS seem to mainly attract bus users and pedestrians, while car users may use BSS more sparingly, mainly for commuting purposes.

ACS Style

Ioannis Politis; Ioannis Fyrogenis; Efthymis Papadopoulos; Anastasia Nikolaidou; Eleni Verani. Shifting to Shared Wheels: Factors Affecting Dockless Bike-Sharing Choice for Short and Long Trips. Sustainability 2020, 12, 8205 .

AMA Style

Ioannis Politis, Ioannis Fyrogenis, Efthymis Papadopoulos, Anastasia Nikolaidou, Eleni Verani. Shifting to Shared Wheels: Factors Affecting Dockless Bike-Sharing Choice for Short and Long Trips. Sustainability. 2020; 12 (19):8205.

Chicago/Turabian Style

Ioannis Politis; Ioannis Fyrogenis; Efthymis Papadopoulos; Anastasia Nikolaidou; Eleni Verani. 2020. "Shifting to Shared Wheels: Factors Affecting Dockless Bike-Sharing Choice for Short and Long Trips." Sustainability 12, no. 19: 8205.

Conference paper
Published: 02 October 2020 in Transactions on Petri Nets and Other Models of Concurrency XV
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In this paper we explore factors that affect Bike Sharing System (BSS) usage and how they differentiate between discrete groups of potential users. BSS have known a rampant growth during recent years, through technological advances, re-evaluated business models and reinvention of the mean’s utility. Yet, for a realized use of dockless BSS and a successful integration in the urban mobility ecosystem to be achieved, the factors that promote willingness to use them need to be explored. By using a sample of 500 stated preference data, classification trees and random forest models are built for three groups of potential BSS users; car users, bus users and pedestrians. Among the considered factors are BSS cost gains, BSS In Vehicle Time (IVT) and Out of Vehicle Time (OVT) gains, trip frequency, purpose and duration. More specific, it was found that BSS potential, increases for short duration trips of up to 21 min for car users. Bus users and pedestrians were found to be more likely to choose a BSS option for a higher cost up to 0,60 and 0,75 euros respectively. On the other side sociodemographic characteristics such as household income, gender, education level and occupation did not found to be the dominant factors for the mode choice decision. OVT is found only to be relatively important for bus users, while the cost gains are comparatively more significant for bus users and pedestrians.

ACS Style

Ioannis Politis; Ioannis Fyrogenis; Efthymis Papadopoulos; Anastasia Nikolaidou; Eleni Verani. Understanding Willingness to Use Dockless Bike Sharing Systems Through Tree and Forest Analytics. Transactions on Petri Nets and Other Models of Concurrency XV 2020, 12250, 784 -795.

AMA Style

Ioannis Politis, Ioannis Fyrogenis, Efthymis Papadopoulos, Anastasia Nikolaidou, Eleni Verani. Understanding Willingness to Use Dockless Bike Sharing Systems Through Tree and Forest Analytics. Transactions on Petri Nets and Other Models of Concurrency XV. 2020; 12250 ():784-795.

Chicago/Turabian Style

Ioannis Politis; Ioannis Fyrogenis; Efthymis Papadopoulos; Anastasia Nikolaidou; Eleni Verani. 2020. "Understanding Willingness to Use Dockless Bike Sharing Systems Through Tree and Forest Analytics." Transactions on Petri Nets and Other Models of Concurrency XV 12250, no. : 784-795.

Conference paper
Published: 02 October 2020 in Transactions on Petri Nets and Other Models of Concurrency XV
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The new generation of bike-sharing services without docking stations is spreading around large cities of the world. The paper provides a technical specification of a platform, for managing a dockless bike sharing system. The bicycles of the platform are equipped with GPS devices and GPRS cards that can transmit, over the Internet, their exact location at any time. We collect and store all events derived from a user’s interaction with the system and in addition the trajectory points of a route during a rent order. The platform aims to fulfill the requirements of bikers, administrators and the research community through the collection, analysis and exploitation of bike sharing data. In the context of the platform, an app for smart devices is implemented for citizens to access the system. A dashboard is offered to the administrator as a valuable tool to inspect, promote the system and evaluate its usage. Last, all stored anonymised data can be accessible for further analysis by the research community through a REST API. The i-CHANGE platform is currently pilot tested in the city of Thessaloniki, Greece.

ACS Style

Lazaros Apostolidis; Symeon Papadopoulos; Maria Liatsikou; Ioannis Fyrogenis; Efthymis Papadopoulos; George Keikoglou; Konstantinos Alexiou; Nasos Chondros; Ioannis Kompatsiaris; Ioannis Politis. i-CHANGE: A Platform for Managing Dockless Bike Sharing Systems. Transactions on Petri Nets and Other Models of Concurrency XV 2020, 12250, 851 -867.

AMA Style

Lazaros Apostolidis, Symeon Papadopoulos, Maria Liatsikou, Ioannis Fyrogenis, Efthymis Papadopoulos, George Keikoglou, Konstantinos Alexiou, Nasos Chondros, Ioannis Kompatsiaris, Ioannis Politis. i-CHANGE: A Platform for Managing Dockless Bike Sharing Systems. Transactions on Petri Nets and Other Models of Concurrency XV. 2020; 12250 ():851-867.

Chicago/Turabian Style

Lazaros Apostolidis; Symeon Papadopoulos; Maria Liatsikou; Ioannis Fyrogenis; Efthymis Papadopoulos; George Keikoglou; Konstantinos Alexiou; Nasos Chondros; Ioannis Kompatsiaris; Ioannis Politis. 2020. "i-CHANGE: A Platform for Managing Dockless Bike Sharing Systems." Transactions on Petri Nets and Other Models of Concurrency XV 12250, no. : 851-867.

Journal article
Published: 27 August 2020 in Research in Transportation Economics
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Competitive Tendering is perhaps the preferred approach for procuring Public Transport (PT) passenger services in the EU, according to its legislation. Cyprus has initiated a few years ago the second PT reform cycle which will be concluded with the awarding of six new concession contracts for passenger services by bus. This paper presents and discusses the two PT reforms in Cyprus. The aim of the second reform is to significantly increase the PT share by improving service availability and quality through the transition from a monopolistic to a more competitive PT market. According to the roadmap prepared by the Cypriot authorities, specific contracting arrangements have been set to attract both local and international PT operators to the competitive tendering process. These arrangements mostly pertain to the eligibility and selection criteria of the tendering process, the opportunity to lease PT buses from local companies and the contract type and duration. The paper sets five main questions addressing critical issues of the reform effort and provides responses through the in-depth analysis of the selected tender and contractual arrangements. Useful findings and conclusions may be drawn, especially regarding the effect of small size market and the lack of necessary PT infrastructure.

ACS Style

Panagiotis Papaioannou; Georgios Georgiadis; Anastasia Nikolaidou; Ioannis Politis. Public Transport tendering and contracting arrangements in countries under regulatory transition: The case of Cyprus. Research in Transportation Economics 2020, 83, 100944 .

AMA Style

Panagiotis Papaioannou, Georgios Georgiadis, Anastasia Nikolaidou, Ioannis Politis. Public Transport tendering and contracting arrangements in countries under regulatory transition: The case of Cyprus. Research in Transportation Economics. 2020; 83 ():100944.

Chicago/Turabian Style

Panagiotis Papaioannou; Georgios Georgiadis; Anastasia Nikolaidou; Ioannis Politis. 2020. "Public Transport tendering and contracting arrangements in countries under regulatory transition: The case of Cyprus." Research in Transportation Economics 83, no. : 100944.

Journal article
Published: 16 June 2020 in Sustainability
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Public transport systems’ effectiveness is a well-recognized pillar of their sustainability. In this study, we employed order-m efficiency estimators to investigate the effectiveness of 57 bus public transport operators that provide services in both large and medium sized European cities. Their effectiveness was simulated through a tailored production model and was evaluated against critical exogenous variables, which were mostly extracted from Eurostat database. Results showed that the effectiveness of the examined operators is generally satisfactory. Our research suggests that certain exogenous factors significantly affect operators’ effectiveness and thus create either advantageous or disadvantageous operational environments for maintaining public transport sustainability. Among these factors, household size, unemployment and car ownership rates were found to be unfavorable to bus public transport operations. Contrary to them, the presence of university students and metro systems in cities create a favorable operational environment for bus public transport effectiveness. These findings assist in the identification of sustainable development policies that would both contribute to public transport sustainability and to the fulfillment of wider community goals. Our findings also rationalize benchmarking exercises in the public transport industry, since they enable fair performance comparisons between systems that seek to incorporate successful management practices to improve their sustainability.

ACS Style

Georgios Georgiadis; Ioannis Politis; Panagiotis Papaioannou. How Does Operational Environment Influence Public Transport Effectiveness? Evidence from European Urban Bus Operators. Sustainability 2020, 12, 1 .

AMA Style

Georgios Georgiadis, Ioannis Politis, Panagiotis Papaioannou. How Does Operational Environment Influence Public Transport Effectiveness? Evidence from European Urban Bus Operators. Sustainability. 2020; 12 (12):1.

Chicago/Turabian Style

Georgios Georgiadis; Ioannis Politis; Panagiotis Papaioannou. 2020. "How Does Operational Environment Influence Public Transport Effectiveness? Evidence from European Urban Bus Operators." Sustainability 12, no. 12: 1.

Journal article
Published: 22 May 2020 in Sustainability
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Mobility is one of the most important and challenging aspects that influence climate change, air quality, and especially the quality of citizens’ lives. Therefore, creating sustainable transport solutions makes way for different modes of transport such as the bicycle, which is continuously gaining more supporters, due to the health, economic, and environmental benefits that it provides. However, cyclists are facing several barriers (e.g., lack of infrastructure), a fact that keeps away commuters from using a bicycle for their daily trips. Investigating the factors that reflect on the commuters’ intention to use a bicycle is a sine qua non for the promotion of sustainable mobility. Therefore, the objective of this paper is the investigation of the factors that prevent residents with low experience or with no cultural/lifestyle background in regards to cycling from cycling. The case study of the city of Larnaca (Cyprus) is deployed by exploring the socio-demographic and trip characteristics of the city’s residents and their relation with the intention to cycle. A two-step approach is developed, namely Explanatory Factor Analysis (EFA) and Structural Equation Modeling (SEM). Despite the promotion of cycling that education is attempting to do (successfully), other factors (such as age, distance, and time) appear to prevent Larnaca’s residents from cycling. Among the actions that local authorities should undertake is that of safety prevention of the vulnerable users of the road network. This group includes elderly people, who need major encouraging interventions by local policymakers and stakeholders.

ACS Style

Paraskevas Nikolaou; Socrates Basbas; Ioannis Politis; Georgios Borg. Trip and Personal Characteristics towards the Intention to Cycle in Larnaca, Cyprus: An EFA-SEM Approach. Sustainability 2020, 12, 4250 .

AMA Style

Paraskevas Nikolaou, Socrates Basbas, Ioannis Politis, Georgios Borg. Trip and Personal Characteristics towards the Intention to Cycle in Larnaca, Cyprus: An EFA-SEM Approach. Sustainability. 2020; 12 (10):4250.

Chicago/Turabian Style

Paraskevas Nikolaou; Socrates Basbas; Ioannis Politis; Georgios Borg. 2020. "Trip and Personal Characteristics towards the Intention to Cycle in Larnaca, Cyprus: An EFA-SEM Approach." Sustainability 12, no. 10: 4250.

Journal article
Published: 15 May 2020 in Transportation Research Interdisciplinary Perspectives
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In this paper we analyse the performance of 34 multimodal public transport networks worldwide to investigate whether the service characteristics of their metro components significantly affect bus performance and vice versa as well as whether their operational environment exerts the same impact on metro and bus public transport modes. We built a combined effectiveness model to simulate the production process of both bus and metro systems and calculated credible performance scores for them by applying data envelopment analysis and bootstrapping techniques. Results showed that, on average, both bus and metro systems require a great ridership increase to reach their best performing peers. We employed conditional robust order-m efficiency estimators to identify factors that may account for these performance rankings. Empirical findings indicate that bus and metro systems more coexist than cooperate in terms of developing their performance profiles. Bus and metro systems are influenced by different exogenous factors and fail to incorporate effectiveness improvements if service upgrades are delivered in their road or rail public transport counterparts. Our findings provide for a better understanding of the interrelationships within multimodal public transport networks and thus contribute to the formulation of both appropriate decision making and realistic performance targets.

ACS Style

Georgios Georgiadis; Panagiotis Papaioannou; Ioannis Politis. Rail and road public transport: Cooperation or coexistence? Transportation Research Interdisciplinary Perspectives 2020, 5, 100122 .

AMA Style

Georgios Georgiadis, Panagiotis Papaioannou, Ioannis Politis. Rail and road public transport: Cooperation or coexistence? Transportation Research Interdisciplinary Perspectives. 2020; 5 ():100122.

Chicago/Turabian Style

Georgios Georgiadis; Panagiotis Papaioannou; Ioannis Politis. 2020. "Rail and road public transport: Cooperation or coexistence?" Transportation Research Interdisciplinary Perspectives 5, no. : 100122.

Articles
Published: 14 April 2020 in Transportation Letters
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Maritime transportation constitutes a dynamic Greek economic sector. Greece accounted for 25% of the Maritime Passenger Traffic (MPT) in the European Union in 2007. However, due to the economic recession since 2009, maritime passenger transportation has been facing increasing fuel prices along with declining demand. In this paper, we develop transfer function models, including macroeconomic indicators, for forecasting the coastal and the Adriatic MPT in Greek ports. The majority of the MPT models include the Gross Domestic Product (GDP) as an explanatory variable, reflecting the financial impact on maritime flows. Although the employment and the economic crisis dummy are also used as explanatory variables, the unemployment and the oil price do not affect MPT. The coastal traffic models are generally more consistent when the seasonality trend is eliminated, while the international traffic models perform better when the inherent seasonality is considered. This first effort contributes toward filling the gap of MPT forecasting models for supporting policy-making on maritime transportation.

ACS Style

Eirini Aivazidou; Ioannis Politis. Transfer function models for forecasting maritime passenger traffic in Greece under an economic crisis environment. Transportation Letters 2020, 1 -17.

AMA Style

Eirini Aivazidou, Ioannis Politis. Transfer function models for forecasting maritime passenger traffic in Greece under an economic crisis environment. Transportation Letters. 2020; ():1-17.

Chicago/Turabian Style

Eirini Aivazidou; Ioannis Politis. 2020. "Transfer function models for forecasting maritime passenger traffic in Greece under an economic crisis environment." Transportation Letters , no. : 1-17.

Journal article
Published: 20 March 2020 in Transportation Research Procedia
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The main goals of this paper include the investigation and evaluation of alternative ramp metering scenarios on a freeway on-ramp and the development of a “smart” signal controller, with the use of PTV Vissim microsimulation software. A complex interchange on the Ring road of Thessaloniki was chosen for the implementation of this study and a drone was used to measure traffic volumes. Using the Vissim platform, a software model was created and its accuracy with respect to the existing situation was evaluated. Different scenarios were developed, and the function of the interchange was observed. In the first set of scenarios, the traffic volume was increased by certain percentage and the results were collected and examined. Next, two new scenarios with the use of ramp metering were developed and a traffic signal was placed on the on-ramp. In the first of these two scenarios, a traffic light with a fixed-time traffic program was placed, whereas in the second one, a vehicle-actuated signal light was created, with the use of the VisVAP add-on. A flow chart was generated and used to program the signal light, so that each time high traffic volume was detected by the detectors that were placed in the expressway, the red light was activated. After all the scenarios were created and examined, certain KPI’s were collected and used for the overall evaluation. The results from the use of the ramp meter, either the fixed-time or the vehicle-actuated, showed that a ramp meter can be very effective in the improvement of the traffic conditions and may have a positive environmental impact.

ACS Style

Danae-Zoe Mitkas; Ioannis Politis. Evaluation of alternative Ramp Metering scenarios on freeway on-ramp with the use of microscopic simulation software Vissim. Transportation Research Procedia 2020, 45, 483 -490.

AMA Style

Danae-Zoe Mitkas, Ioannis Politis. Evaluation of alternative Ramp Metering scenarios on freeway on-ramp with the use of microscopic simulation software Vissim. Transportation Research Procedia. 2020; 45 ():483-490.

Chicago/Turabian Style

Danae-Zoe Mitkas; Ioannis Politis. 2020. "Evaluation of alternative Ramp Metering scenarios on freeway on-ramp with the use of microscopic simulation software Vissim." Transportation Research Procedia 45, no. : 483-490.