Dimitris Efthymiou

Ernst & Young · Advisory Services

Global Navigation Satellite Systems (GNSS) have tremendous impact and potential in the development of Intelligent Transportation Systems (ITS) and mobility services, expected to deliver significant benefits including increasing capacity, improving safety and decreasing pollution. There are, however, situations where there might not be direct locati...

Research was conducted to measure the effects of the economic crisis on public transport quality, user satisfaction, and transit demand. The survey used in this research extended a research effort that began in 2008; the survey aimed to analyze the variability of users' satisfaction within different public transport systems. The survey was conducte...

The unprecedented economic crisis experienced by Greece is fertile ground for research at myriad levels. In this paper, the authors aim to investigate the effects of the crisis on real estate prices by measuring the impact of transportation infrastructure location. For the purposes of this research, on-line real estate data collected in 2011, when...

Transportation patterns in big cities are redefined by the growing trend of car ownership and usage costs (e.g. the initial cost of buying a car, the constantly growing fuel prices, additional maintenance and insurance costs and the increased parking demand and time of travel). Under these circumstances, the demand for alternative vehicle-sharing t...

Road crash fatalities and debilitating injuries are preventable, both before and after the crash occurrence. The provision of medical care in cases of road crashes is among the most defining elements in trauma handling, with the care provided within the first hour (a period frequently termed as the golden hour) significantly decreasing mortality. A...

This paper continues the research effort that the authors begun in 2008 on the quality factors that affect adoption of public transportation and retention of its users. The objective of this paper is to explore the impacts of the deep, 7-year economic crisis, on the perceptions of public transport users, with bus as their main transport mode, about...

In this study, the possible causal links between the built environment, travel attitudes and travel behaviour of people that have moved between totally different urban and transportation contexts were investigated. A quasi-longitudinal design was developed to collect data about the perceived neighbourhood characteristics, neighbourhood preferences,...

Introduction: As part of the overall goal of carbon emissions reduction, European cities are expected to encourage the electrification of urban transport. In order to prepare themselves to welcome the increased number of electric vehicles circulating in the city networks in the near future, they are expected to deploy networks of public electric ve...

Transportation infrastructure and urban development are tightly connected and interact with each other. The objective of this paper is to measure the impact of large-scale transportation infrastructure locations on land cover. Spatial econometric models that link the impact of transportation infrastructure onto the urban evolution have been used wi...

Carsharing combines the positive elements of both private and public transportation. This feature renders it attractive to a significant percentage of the population, especially younger people who do not own a car. To maximize the effectiveness of such systems, the characteristics of potential users have been investigated in this research. The prop...

The provision of medical care in cases of road crashes is among the most defining elements in trauma handling. A characteristic evidence is the identification that people involved traumatic accidents that are handled within the first hour after the event (a period frequently termed as the “Golden Hour”) exhibit significantly decreased morbidity and...

Given the importance of reducing Europe's dependence on imported oil and cutting carbon emissions from road transport by 60% until 2050, the EU has set the goal to diminish the number of conventionally fuelled vehicles in urban areas. Cities are expected to develop comprehensive sustainability plans and establish an aggressive strategy to reduce tr...

Recent quasi-longitudinal studies have offered evidence on the causality of the relationship between built environment and travel behavior. However, these studies have focused on residential moves within the same region, thus limiting the extent of movers’ exposure to different built environments and possibly underestimating the built environment e...

Global navigation satellite systems have tremendous impact and potential in the development of intelligent transportation systems and mobility services and are expected to deliver significant benefits, including increased capacity, improved safety, and decreased pollution. However, there are situations in which there might not be direct location in...

Safety analysis in service systems –especially in extensive systems involving large populations of users and operators- corresponds to an issue requiring special attention and research. Road service systems stand for a distinguished paradigm of such cases, that users’ safety determines the provided level-of-service and are related to decisions made...

The generation of synthetic populations through simulation methods is an important research topic and has a key application in agent-based modeling of transport and land use. The next step in this research area is the generation of complete synthetic households; this research area requires some way to associate synthetic persons with household posi...

The need for forecasting the direct and indirect effects of land use and transport policies on society, the environment, and the local economy has led to the development of integrated land use and transport (LUTI) models. The land use and transport policy evaluation is based on point estimators of economic sustainability indicators, usually compute...

The use of Hard Shoulder Running (HSR) systems is a relatively recent control policy aiming to ameliorate traffic conditions in recurrent congested networks. This ITS strategy attracts researchers and practitioners interest, in an attempt to assess its impact on drivers’ behavior. The objective of this study is to analyze and optimize the operation...

Responding to an impending demand growth at an existing reactive managed lane system, and in order to provide a timely and more effective temporary hard shoulder activation, short-term prediction models are developed. A lane-oriented attribute, namely the left lane flow distribution ratio (LLFDR), is introduced, aiming to ameliorate the system by c...

The interaction between land use and transportation infrastructure is a topic that has been extensively researched and continues to be of interest as new underlying economic, infrastructure and environmental conditions emerge. In this research, the direct and indirect effects of transportation infrastructure and policies on house prices and rents a...

Managed lanes systems are a recently developed traffic management scheme, aiming to alleviate the congested arteries. Hard shoulder management systems have been efficiently deployed in Europe, America and Asia. Furthermore, during the last few years, such systems have been implemented in Switzerland as strategies to address recurring peak hour cong...

Hard shoulder running systems are usually employed in order to mitigate traffic congestion in freeways. This research presents an exploratory analysis based on data collected from seven radars across a two-lane freeway equipped with hard shoulder that connects Geneva with Lausanne in Switzerland. The variation of the lane flow distribution ratio, d...

The Land-Use Model UrbanSim and the agent-based tra�c simulation model MATSim, are being further developed and integrated under the framework of the Sustaincity project, that is funded by the European Union FP7. UrbanSim di�ers from the other Integrated Land-Use and Transport models, as it adopts an approach of dynamic disequilibrium, it can foreca...

The importance of modeling the interactions between transportation infrastructure and land use has been demonstrated through a large number of studies. The aim of this paper is, on the one hand, to measure the effect of transportation infrastructure and land-use characteristics on dwelling prices and rents in Thessaloniki, Greece, and, on the other...

Transportation patterns in big cities are redefined by the growing trend of car ownership and usage costs (e.g. the initial cost of buying a car, the constantly growing fuel prices, additional maintenance and insurance costs and the increased parking demand and time of travel). Under these circumstances, the demand for alternative vehicle-sharing t...

People's perceptions about the appropriate location of mobility centers are modeled. A case study for the Municipality of Kalamaria in Thessaloniki, Greece, is presented. The results of a stated preference survey, which revealed residents' perceptions about the optimal locations for these centers, as well as the spatial and other characteristics of...

Each year, more than 200 pedestrians are involved in severe road accidents in Greece. This study aims to shed some light on vehicle-pedestrian crashes, which resulted in killed or severely injured pedestrians. For that purpose, data from year 2009 were used. The database consists of 206 killed and severely injured pedestrians in the greater Athens...

The number of electric vehicles and related infrastructure (in particular chargers) are expected to increase significantly in the near future. Models and guidelines for the optimum location of the electric vehicles infrastructure are not well addressed in the current literature and this research aims to provide some insight towards this direction....

The multi-characteristic synthesis of internet and social network users (different nationality, age, education level, interests) renders these platforms powerful tools, suitable for many purposes. Until now, businesses use them for marketing, political candidates for their election campaigns, information networks for news updates, companies for rec...