Passenger Car Equivalent Value for Commercial Vehicles: A New Approach

Within the framework of the present paper an attempt has been made to develop a methodology for the calculation of a Passenger Car Equivalent (PCE) factor in order to express the number of commercial vehicles in the equivalent number of passenger cars. The methodology is based on the Highway Capacity Manual, the examination of the international literature and an extended field survey. The research area is the Municipality of Thessaloniki, Greece and specifically 27 at-grade, signalized intersections which were examined. The field survey was performed during two time-periods in order a comparison to be possible

Pan-European Corridor X Development: Case of Literal Implementation of the European Transport Strategy Itself or of Change of the General Environment in the Region?

AbstractIn this paper the implementation of the European Transport Strategy in the case of Corridor X during the last decade is presented. Data and information collected on all the projects along the Corridor and the effective investments realized during the last decade are presented, so that sound conclusions can be formulated concerning the conditions, under which the projects were promoted for implementation, taking also into account strategies, policies, negotiations, initiatives and activities that affected the development of the specific Corridor

Parking Policies for Supporting Sustainable Mobility

AbstractParking policies have become an integral part of modern urban planning strategies as transportation planners and engineers have recognized the substantial impact they may have on mode choice and travel routes, directly affecting urban mobility characteristics. For parking policies to be truly valuable and effective, they should be carefully integrated into a transport development plan aiming to achieve the long–term targets of sustainable mobility. To this end, this paper investigates the impact of parking policies on urban mobility characteristics and then highlights, through a case study in a medium–sized Greek city, the actions to be undertaken for their successful implementation

Assessing School Travel Safety in Scotland: An Empirical Analysis of Injury Severities for Accidents in the School Commute

School travel has been a significant source of safety concerns for children, parents, and public authorities. It will continue to be a source of concerns as long as severe accidents continue to emerge during pupils’ commute to school. This study provides an empirical analysis of the factors influencing the injury severities of the accidents that occurred on trips to or from school in Scotland. Using 9-year data from the STATS19 public database, random parameter binary logit models with allowances for heterogeneity in the means were estimated in order to investigate injury severities in urban and rural areas. The results suggested that factors such as the road type, lighting conditions, vehicle type, and age of the driver or casualty constitute the common determinants of injury severities in both urban and rural areas. Single carriageways and vehicles running on heavy oil engines were found to induce opposite effects in urban and rural areas, whereas the involvement of a passenger car in the accident decomposed various layers of unobserved heterogeneity for both area types. The findings of this study can inform future policy interventions with a focus on traffic calming in the proximity of schools

Investigation of Distracted Pedestrians' Exposure Duration at Signalized and Unsignalized Pedestrian Crossings: A Bayesian Modeling Approach

During the last decades, distraction caused by mobile phones has created concerns about pedestrians' safety, especially while crossing a road. The aim of this paper is to investigate the factors that have an effect on the crossing duration of pedestrians, distracted by mobile phone use, at both signalized and unsignalized crossings. Pedestrians with mobile phones were observed during crossing the aforementioned types of crossings in Thessaloniki, Greece, while their crossing duration was further examined via the development of Bayesian regression models, one for unsignalized and one for signalized crossings. For the research purposes, 554 pedestrians were observed at unsignalized crossings and 409 at signalized ones. The most commonly observed type of distraction was talking on the mobile phone, while texting was also found to be very common. The variables, found to be associated with crossing duration, were significantly different between unsignalized and signalized crossings. Crossing duration at unsignalized crossings seemed to be affected by the experience of a potential conflict with a motorized vehicle and the presence of additional distractors, such as the carrying of an object and the presence of company. At signalized crossings, duration tended to be influenced by the age of the pedestrian and the position before crossing. Current research contributes in understanding and modeling distracted pedestrians' behavior when crossing streets

Analysis of In-Vehicle Warning System for Rail-Road Level Crossings: Case Study in the City of Thessaloniki, Greece

The present research has investigated the impact of a Cooperative – Intelligent Transport Systems service for increasing Rail – Road Level Crossing safety, in terms of driving dynamic of the taxi drivers who used the service at the city of Thessaloniki, Greece. The Cooperative – Intelligent Transport Systems service informed drivers when approaching a Rail – Road Level Crossing, through 6 different paths, at the western area of the city of Thessaloniki. The results were yielded after comparing two datasets concerning the use of the Cooperative – Intelligent Transport Systems service by 168 taxi drivers for 28 days and without the use of the Cooperative – Intelligent Transport Systems service by 15 taxi drivers for 25 days. Even if conclusions are contrasting for the different types of the Rail – Road Level Crossing transits, the findings highlight a relation between speed reduction with types of transits whose first road segment is rectilinear, during Cooperative – Intelligent Transport Systems service use, while minor differentiations are noticed for Rail – Road Level Crossing transits with sharp turns and stop signs

Pedestrian level of service assessment in an area close to an under-construction metro line in Thessaloniki, Greece

Abstract Pedestrian mobility is one of the most sustainable transport alternatives as it offers significant environmental, social and economic benefits. In fact, the non-motorization contributes to the reduction of emissions and at the same time, walking is able to revive purchases and also sociality and communication between people. The present paper focuses on the assessment of a section of a pedestrian area located in the center of the Municipality of Kalamaria, which is one of the biggest Municipalities in the Thessaloniki Metropolitan area, Northern Greece. The pedestrian area which was examined includes the oldest and most important pedestrian street in the Municipality, as it is located in the central business district (CBD) and it serves a large number of pedestrian flows on a daily basis. Also, the construction of a metro station in the area is expected to further increase the pedestrian flows. The analysis of the paper includes the evaluation of the existing situation of the pedestrian street through Viswalk, which is a microscopic software for pedestrian simulation. The aim of the specific evaluation is the identification of variations in the Level of Service (LOS), as the pedestrian composition and flows change. The results of the simulation show that even tripling the pedestrian flow in the pedestrian area will not cause a significant drop in LOS, with the exception of specific sections of the pedestrian street, where bottlenecks are formed

Trip and Personal Characteristics towards the Intention to Cycle in Larnaca, Cyprus: An EFA-SEM Approach

Mobility is one of the most important and challenging aspects that influence climate change, air quality, and especially the quality of citizens&rsquo 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&rsquo 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&rsquo 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&rsquo 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. Document type: Articl

Comparison of red-light running (RLR) and yellow-light running (YLR) traffic violations in the cities of Enna and Thessaloniki

Abstract This paper investigates the characteristics of Red-Light Running (RLR) and Yellow-Light Running (YLR) traffic violations at three signalized intersections which are located in the city of Enna, Italy, and four signalized intersections which are located in the city of Thessaloniki, Greece. The trigger for this particular research is that there are cases in the literature in which the driving styles, as far as compliance with the Highway Code regulations is concerned, change from city to city and from country to country. Two sets of counts were used in the framework of this paper in order to investigate this phenomenon. The first one concerns the year 2018 in Enna and the second one the year 2015 in Thessaloniki. Descriptive and inferential statistics were used in order to analyze the collected data and more specifically to investigate the correlation between the violations at signalized intersections in both cities. One of the most important findings of the specific research is that private cars are the responsible for the vast majority of the violations at the signalized intersections. In addition, it was found that traffic lane plays a significant role in the under study traffic violations

Estimation of road traffic induced environmental pollutants based on a point-to-point traffic detection system

This paper aims at the estimation of road traffic induced environmental pollutants for the city of Thessaloniki, based on travel time detections of a point-to-point detection system. The hourly and daily pollutant emissions (NOx, CO, HC) and fuel consumption (FC) were estimated based on the COPERT model and include hot emissions of passengers’ cars circulating in high hierarchy links of the transport network. The system detections (travel time) were correlated based on each path’s length, in order to determine the average vehicle speed per analyzed time interval, which was the main determinant for calculating traffic induced emissions. The paper concludes with a sensitivity analysis based on link capacity and the prevailing traffic flow characteristics for optimally determining the vehicle speed and flow that minimize environmental pollutants