George Yannis

George Yannis
National Technical University of Athens | NTUA · Department of Transportation Planning

PhD

About

432
Publications
94,687
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
5,141
Citations
Additional affiliations
March 1993 - present
National Technical University of Athens
June 1991 - July 2016
National Technical University of Athens
Position
  • Professor (Full)

Publications

Publications (432)
Article
Harsh driving behavior events, such as harsh braking events (HBs) are road safety surrogate measures showing promising research venues towards crash mitigation, such as safety evaluations based on high-resolution driving data from smartphone sensors. This research presents a framework for aggregation and modelling of such data to highlight safety c...
Article
The present study aims to investigate the impact of texting and web surfing on the driving behavior and safety of young drivers on rural roads. For this purpose, driving data were gathered through a driving simulator experiment with 37 young drivers. Additionally, a survey was conducted to collect their demographic characteristics and driving behav...
Article
The paper proposes a general framework for the assessment of the impacts of the introduction of Connected and Automated Transport Systems (CATS) on traffic. The main objective is to address the question of scalability and transferability of the identified impacts of Autonomous Vehicles (AVs) in particular, focusing on network performance of urban a...
Article
The advent of autonomous vehicles will soon transform transportation in a substantial way, but at the same time their public acceptance is questionable. Although there is much research carried out, studies analyzing choices of people regarding autonomous, semi-autonomous, and traditional vehicles are relatively scarce. Thus, the purpose of this pap...
Article
The advent of autonomous vehicles brings major changes in the transportation systems influencing the infrastructure design, the network performance, as well as driving functions and habits. The penetration rate of this new technology highly depends on the acceptance of the automated driving services and functions, as well as on their impacts on var...
Article
Electromobility and alternative fuels are considered to be significant players towards the reduction of energy consumption and emissions produced by road transportation sector. Governments, municipalities, public and private authorities, and institutions take significant steps for promoting these technologies by adopting effective, efficient and ta...
Article
This paper discusses the characteristics, investments and impacts of the Chinese One Belt One Road (OBOR) initiative in the Eastern Mediterranean ports and Eastern European countries with particular emphasis on its realization in Greece in the port of Piraeus and the so-called Land-Sea bridge railway connections of this port to Eastern European cou...
Article
Full-text available
Universities are centers of knowledge and their Campuses are like small cities, thus making them the ideal place to develop, apply and evaluate policies and tools for innovative mobility solutions that can subsequently be extended to other contexts. A review of mobility measures in different European Universities has revealed that many of them appl...
Article
National focus on individual freedom versus paternalistic values is a fundamental theme, which defines the status of traffic safety in different countries. The present study examines the role of such values in road safety culture based on survey data from car and bus drivers from three countries with distinctly different road safety records: Norway...
Article
Transportation systems face ever-increasing challenges due to escalating urbanization. Ageing transportation infrastructure struggles to meet today’s needs while personal choices related to urban transportation have evolved in a way that car-oriented transport policies of the past are no longer adequate. As a result, a paradigm shift supporting pub...
Article
Full-text available
Driving while fatigued is a considerably understudied risk factor contributing to car crashes every year. The first step in mitigating the respective crash risks is to attempt to infer fatigued driving from other parameters, in order to gauge its extend in road networks. The aim of this study is to investigate the extent to which declared fatigued...
Article
High-capacity Connected and Autonomous Vehicles (CAVs) are expected to be extensively utilized by on-demand services. This paper aims to assess the impacts of large-scale autonomous on-demand mobility services on traffic, environment, and road safety, under various service specifications using microsimulation. To that end, an urban on-demand shuttl...
Article
Autonomous point to point shuttles are an emerging paradigm of a future mobility-on-demand ecosystem. However, the traffic and environmental impacts of their operation are largely under researched especially in relation to influential infrastructure related factors and service-related specifications. The scope of this study is to reveal the factors...
Article
Background: The driving behavior of patients with mild Alzheimer's disease dementia (ADD) and patients with mild cognitive impairment (MCI) is frequently characterized by errors. A genetic factor affecting cognition is apolipoprotein E4 (APOE4), with carriers of APOE4 showing greater episodic memory impairment than non-carriers. However, differenc...
Poster
Full-text available
Introduction: Patients with Alzheimer's Disease Dementia (AD) face increasing driving difficulties as the disease progresses and, at some point, cease driving. We sought to identify predictors of driving cessation among patients with AD. Methods: We examined 28 patients with mild AD (26 Males, Mean Age 74 years old). Baseline evaluation included n...
Article
The current study aims to investigate the impact of the COVID-19 pandemic on road traffic collisions, fatalities, and injuries using time series analyses. To that aim, a database containing road collisions, fatalities, and slight injuries data from Greece were derived from the Hellenic Statistical Authority (HSA) and covered a ten-year timeframe (f...
Article
The Internet of Things (IoT) constantly offers new opportunities and features to monitor and analyze driver behavior through wide use of smartphones, effective data collection and Big Data analysis, resulting in assessment and improvement of driver behavior and safety. The objective of the present study is to investigate the impact of detailed trip...
Article
The risk of being involved in a road crash is typically influenced by mobility, which in turn is influenced by various socioeconomic indicators. This study aims to investigate the impact of socioeconomic and transport indicators on road safety during the economic crisis period in Europe. A database containing Human Development Index (HDI), suicides...
Article
Powered Two-Wheeler (PTW) riders constitute a very vulnerable group of road users, while riding a PTW is considerably more dangerous than using any other motor vehicle. Behavioral issues have been identified major moderating factors to PTW crashes, as riders display great variability in their attitudes towards road safety. Τhe aim of this paper is...
Conference Paper
Driving simulators have become widely used tools for examining the impact of driver behaviour with respect to individual driver differences or road layout by offering a safe, realistic, and controlled environment. In this research, a driving simulator experimental design is provided for testing the main risk factors defined within the i-DREAMS proj...
Article
Objective The objective of the present study is twofold: (i) to explore the riding behavior of motorcyclists while speeding, based on detailed riding analytics collected by smartphone sensors, and (ii) to investigate whether personalized feedback can improve motorcyclist behavior. Methods In order to achieve the objective, a naturalistic riding ex...
Article
Driving under the influence of alcohol, drugs and fatigue are all important factors of crash causation. Exploring the link between driver attitudes and crash involvement provides understanding on these important issues. To that end, questionnaire answers of car drivers disclosing their attitudes on the impacts of driving under the influence of alco...
Article
This paper attempts to shed light on the temporal evolution of driving safety efficiency with the aim to acquire insights useful for both driving behavior and road safety improvement. Data exploited herein are collected from a sophisticated platform that uses smartphone device sensors during a naturalistic driving experiment, at which the driving b...
Article
Introduction: COVID-19 has disrupted daily life and societal flow globally since December 2019; it introduced measures such as lockdown and suspension of all non-essential movements. As a result, driving activity was also significantly affected. Still, to-date, a quantitative assessment of the effect of COVID-19 on driving behavior during the lock...
Article
Intraindividual variability is a fundamental behavioural characteristic of aging but has been examined to a very limited extent in driving. This study investigated intraindividual variability in driving simulator measures in healthy drivers of different ages using the coefficient of variation (COV) as a variability measure. Participants were health...
Article
Introduction: Currently, risky driving behaviour is a major contributor to road crashes and as a result, wide array of tools have been developed in order to record and improve driving behaviour. Within that group of tools, interventions have been indicated to significantly enhance driving behaviour and road safety. This study critically reviews mo...
Article
Introduction: The number of road fatalities have been falling throughout the European Union (EU) over the past 20 years and most Member States have achieved an overall reduction. Research has mainly focused on protecting car occupants, with car occupant fatalities reducing significantly. However, recently there has been a plateauing in fatalities...
Chapter
According to European urban sustainable planning guidelines, road safety corresponds to one of the most important elements of cities’ performance. Several methods have been developed over the years for supporting policy-making, towards the improvement of road safety levels mainly at the national level. In this study, a methodological framework is d...
Chapter
The Internet of Things (IoT) constantly offers new opportunities and features to monitor and analyze driver behaviour through wide use of smartphones, effective data collection and Big Data analysis. In that framework, the aim of this paper is to investigate the impact of mobile phone use on driving behaviour and road safety through the investigati...
Article
Full-text available
According to the annual accident report (2018) of the European Commission it is clear that during the decade 2007-2016 fatalities by mode of transport have dropped significantly inside the European Union (EU). However, there is always a place for further improvements. It is also clear that the changes in the socio-economic and demographic context o...
Article
Despite important efforts and progress, road crashes constitute a major public health problem worldwide, since each year 1.35 million people are killed in road crashes, with far higher burden of fatalities in low- to middle-income countries (LMIC). Human factors are the main contributory factors in crashes, however their complex interaction with el...
Chapter
Full-text available
This thematic ESRA report on Moped drivers and Motorcyclists seeks to elucidate performance and attitudes of PTW riders regarding road safety in 32 countries (20 European, 2 North American, 5 Asian-Oceanian, 5 African). It includes comparisons between countries/regions and demographic characteristics. Binary logistic regression models were develope...
Article
Full-text available
For the purpose of exploring the factors affecting injury severity of children and adolescents involved in traffic crashes in Greece, disaggregate crash data including 13,431 involving children and adolescents from all regions of Greece for the period 2006-2015 were utilized. In order to identify factors affecting injury severity and account for po...
Chapter
The autonomous vehicles are expected to bring unprecedented changes in the labor sector and the workforce. Traditional jobs will be alleviated, new will be created while people involved in the autonomous vehicle operation should be qualified with additional skills and knowledge in order to be able to deal with the new technology and the various sys...
Chapter
Electromobility and alternative fuels are considered as key solutions towards the reduction of emissions and energy savings in order to achieve more sustainable and environmentally friendly transportation systems. European countries are trying to achieve significant progress in promoting these new technologies in order to ensure better life and air...
Article
Depression has been found to significantly increase the probability of risky driving and involvement in traffic collisions. The majority of studies correlating depressive symptoms with driving, pursue to predict the differences in driving behavior if the driver has already been diagnosed. Little evidence can be found, however, on how mental and psy...
Article
Full-text available
Pedestrians, cyclists and powered two-wheeler riders are considered vulnerable road users, as they are prone to a high risk of injury in the event of vehicular collision. This paper sought to elucidate the road safety performance and attitudes of vulnerable road users in 32 countries. In addition, comparisons between countries and demographic chara...
Article
Road safety is a major issue in every society. The assessment of driving ability with a real vehicle is a lengthy and costly process; therefore, there is a growing need for the development of a neuropsychological battery that can provide a fast and reliable evaluation of a person's cognitive fitness to drive. In the present study, we examined the r...
Article
The objective of this research is to exploit high resolution driving behavior data collected via sensors of smartphones from 303 drivers in order to examine driver behavior at road segment and junction level. These sensor data are combined with traffic and road geometry characteristics and subsequently depicted spatially using Geographical Informat...
Article
Full-text available
The spread of the new coronavirus COVID-19, has led to unparalleled global measures such as lockdown and suspension of all retail, recreation and religious activities during the first months of 2020. Nevertheless, no scientific evidence has been reported so far with regards to the impact on road safety and driving behavior. This paper investigates...
Article
Road safety is connected with pavement skid resistance which often triggers pavement maintenance issues. So far, many laboratory studies have been conducted trying to find a link between skid resistance and macrotexture. However, the findings cannot be extrapolated always in the field because of the multi-parametric nature of skid resistance. This...
Article
Full-text available
The aims of the study are to (1) compare the road safety behaviors among car drivers and motorcyclists in five different regions in Norway and Greece, (2) examine the factors influencing the road safety behaviors in these groups, and (3) examine the relationship between road safety behaviors and accident involvement. The study is based on survey an...
Article
Full-text available
Consistent decision-making requires a structured and systematic evaluation of advantages and disadvantages of different choice possibilities. For transport projects, policies or policy measures, and transport options evaluation, various multi-criteria methods have been developed and effectively applied to complement conventional cost effectiveness...
Article
In road safety studies, spatial analyses are often implemented in order to reveal patterns of spatial variation and to examine the presence of spatial autocorrelation in road crash occurrences. Spatial analyses frequently employ exposure parameters in order to allow for comparisons between models. In this paper, meta-regression techniques are appli...
Article
Objective: More and more pedestrians use mobile phones in their daily traffic activities by the roadside or even when crossing the street. The objective of this research is to examine pedestrians’ traffic and safety behavior while texting or web-surfing, when crossing signalized intersections. Methods: In order to compare the behavior of distracted...
Chapter
Pavement friction significantly affects the road safety. Over years, researchers have developed multiple models in an attempt to estimate pavement friction performance. The present study aims at developing a stochastic model for the prediction of short-term friction loss based on field-friction data, which adapts the survival probability analysis i...
Presentation
Introduction: Driving ability of patients with neurodegenerative diseases interferes with their everyday functionality and is subjected to neurological evaluation. We examined the self perception of patients with Mild Cognitive Impairment (MCI) or mild Alzheimer's Disease Dementia (AD) regarding their driving ability and their driving habits throug...
Article
Full-text available
The aim of this paper was to provide a methodological framework for estimating the amount of driving data that should be collected for each driver in order to acquire a clear picture regarding their driving behavior. We examined whether there is a specific discrete time point for each driver, in the form of total driving duration and/or the number...
Conference Paper
Advanced vehicle automation and the incorporation of more digital technologies in the task of driving, bring about new challenges in terms of the operator/vehicle/environment framework, where human factors play a crucial role. This paper attempts to consolidate the state-of-the-art in driver state measuring, as well as the corresponding technologie...
Article
Objectives To examine the driving variables that predict accident probability in mild dementia due to Alzheimer's disease (AD), mild cognitive impairment (MCI) and healthy older control drivers in simulated driving. To compare the three groups in mean performance and in frequency of scores exceeding 1.5 SD from the mean. Methods/Design Participant...
Book
This report examines the traffic safety of pedal cycles, electrically assisted cycles and electrically powered personal mobility devices such as e-scooters, whether owned or shared, in an urban context. In a fast-evolving urban transport environment, micromobility is changing how people move on a daily basis. This brings new and urgent challenges f...
Article
Introduction: Technological advancements during recent decades have led to the development of a wide array of tools and methods in order to record driving behavior and measure various aspects of driving performance. The aim of the present study is to present and comparatively assess the various driver recording tools that researchers have at their...
Article
Full-text available
Africa is the worst performing continent in road safety: the fatality rate, 26.6 per 100.000 inhabitants, is almost three times that of Europe’s and fatalities per capita are projected to double from 2015 to 2030 (WHO, 2015). This is mainly due to the fact that Emerging Economies are experiencing increases in traffic, for which their traffic system...
Article
Full-text available
This paper was conducted in the framework of the "SKILLFUL - Skills and competences development of future transportation professionals at all levels" project, financed by the European Commission. The objective of the paper is to map the major trends of the transport workforce with regards to demographic, behavioural, cultural and socioeconomic fact...
Article
Full-text available
This paper deals with the problem of improving the existing optimization techniques for Data Envelopment Analysis (DEA). The algorithm proposed herein is a combination of the “quickhull algorithm” and a DEA algorithm written in Python programming language. To the best of the authors’ knowledge no prior effort has been made to date to propose a meth...
Article
Full-text available
The paper aims to provide a critical overview of the infrastructure risk factors in African countries performed within the research project "SaferAfrica - Innovating dialogue and problems appraisal for a safer Africa". The project is funded by the European Commission’s Horizon2020 research and innovation programme. Both macroscopic (generic level)...
Article
Full-text available
University campuses are a microcosmos of the urban landscape and an excellent testbed for implementing and evaluating novel mobility policies. However, no scientific contribution has ever aimed to provide a template for university mobility managers to develop an action plan for an efficient and effective sustainable university mobility plan tailore...
Article
Full-text available
The aim of this paper is the development of driver speed models based on detailed driving data collected from smartphone sensors. More specifically, this research investigates to which extent various driving behaviour parameters (harsh acceleration and deceleration events, driving distance, percentage of driving time per different road types, etc.)...
Article
Full-text available
This research aims to correlate drivers’ characteristics with their safety performance. In order to achieve this objective, two different data sets were used deriving from 12 drivers who participated on an on-road driving experiment while being assessed by a safety behaviour expert. Drivers participating in the experiment also responded to the ques...
Article
This paper aims to provide a methodological framework for the comparative evaluation of driving safety efficiency based on Data Envelopment Analysis (DEA). The analysis considers each driver as a Decision Making Unit (DMU) and aims to provide a relative safety efficiency measure to compare different drivers based on their driving performance. The l...
Article
The aim of this paper is to explore driving behaviour during mobile phone use on the basis of detailed driving analytics collected by smartphone sensors. The data came from a sample of one hundred drivers (18,850 trips) during a naturalistic driving experiment over four months. A specially developed smartphone application was used, through which dr...
Article
Spatial analyses of crashes have been adopted in road safety for decades in order to determine how crashes are affected by neighboring locations, how the influence of parameters varies spatially and which locations warrant interventions more urgently. The aim of the present research is to critically review the existing literature on different spati...
Conference Paper
Full-text available
Short-term traffic forecasting is a field of research that has always attracted significant attention. The recent introduction of Machine Learning techniques in traffic forecasting has broadened the researchers’ horizons, making fresher approaches possible. However, researchers should not disregard the importance of spatiotemporal relations of a ro...
Article
The objective of this paper is to describe the attitudes and opinions of Europeans on speeding and compare them amongst countries and based on demographic characteristics as well as to provide a number of recommendations to be used in the effort to reduce speeding and improve road safety. The analysed data were collected within the E-Survey of Road...
Article
The aims of the present paper are to: (1) Examine the influence of national safety culture, sector safety focus and organizational safety culture on the safety behaviours of professional drivers, compared with other explanatory variables (e.g. age, type of transport, working conditions), and to (2) Examine the influence of safety behaviours and oth...
Article
Objective: Considerable evidence indicates that medical conditions prevalent among older individuals lead to impairments in visual, cognitive, or psychomotor functions needed to drive safely. The purpose of this study was to explore the factors determining driving difficulties as seen from the viewpoint of 30 older drivers with mild cognitive impai...
Article
Full-text available
While Norway had the lowest road mortality rate in Europe in 2017, Greece had one of the worst road safety records of all EU-27 countries. The present study investigates road safety culture (RSC) as an explanation for this discrepancy by: (1) Comparing the road safety behaviours among professional and private drivers in Norway and Greece, (2) Exami...
Article
The objective of this paper is the review and comparative assessment of infrastructure related crash risk factors, with the explicit purpose of ranking them based on how detrimental they are towards road safety (i.e. crash risk, frequency and severity). This analysis was carried out within the SafetyCube project, which aimed to identify and quantif...