David Llopis-Castelló

David Llopis-Castelló
Universitat Politècnica de València | UPV · Department of Transport Infrastructure and Engineering

PhD

About

51
Publications
3,772
Reads
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229
Citations
Introduction
Dr. David Llopis Castelló is an Assistant Professor in the School of Civil Engineering at Universitat Politècnica de València (Spain). His main interest is focused on Road & Cycling Safety, Road Geometric Design, Geometric Design Consistency, Autonomous Vehicles, Drivers' Behavior, and Pavement Maintenance.
Additional affiliations
October 2019 - present
Universitat Politècnica de València
Position
  • Professor (Assistant)
March 2019 - October 2019
Universitat Politècnica de València
Position
  • Research Associate
March 2018 - March 2019
Universitat Politècnica de València
Position
  • PostDoc Position
Education
April 2015 - March 2018
Universitat Politècnica de València
Field of study
  • Road safety
September 2013 - December 2014
University of Valencia
Field of study
  • Maths
September 2011 - July 2012
Universitat Politècnica de València
Field of study
  • Highway Engineering

Publications

Publications (51)
Article
Full-text available
Automated vehicles are designed to maintain both longitudinal and transverse control along a road section under certain favorable conditions. The conditions that ensure a safe operation of an automated vehicle are referred to as Operational Design Domain (ODD). So far, the concept of ODD has focused on the automated vehicle and how it is designed t...
Article
A critical step when managing road pavement is the assessment of pavement condition. Despite the automatic and objective methods used in rural roads, the most common used method in urban areas is the development of visual surveys filled out usually by technicians that leads to a subjective pavement assessment. To provide an efficient, objective, an...
Article
Full-text available
Mobility patterns and lifestyles have changed in recent years in cities worldwide, thanks to the strong rise in modes of travel commonly referred to as micromobility. In this context, e-scooters have experienced a great rise globally which has led to an increase of crashes involving this type of micromobility vehicle in urban areas. Thus, there is...
Article
Full-text available
The analysis of road safety is critical in road design. Complying to guidelines is not enough to ensure the highest safety levels, so many of them encourage designers to virtually recreate and test their roads, benefitting from the evolution of driving simulators in recent years. However, an accurate recreation of the road and its environment repre...
Article
Full-text available
In Spain, a new challenge is emerging due to the increase of many recreational bicyclists on two-lane rural roads. These facilities have been mainly designed for motorized vehicles, so the coexistence of cyclists and drivers produces an impact, in terms of road safety and operation. In order to analyze the occurrence of crashes and enhance safety f...
Article
Full-text available
Various studies have been recently conducted to predict pavement condition, but most of them were developed in a certain region where climate conditions were kept constant and/or the research focused on specific road distresses using single parameters. Thus, this research aimed at determining the influence of pavement structure, traffic demand, and...
Article
Pavement management systems can be used to efficiently allocate limited maintenance budgets to better align with pavement deterioration. However, pavement deterioration is subject to uncertain factors that complicate the prediction of future pavement conditions accurately, entailing differences in the optimum maintenance strategy. This paper addres...
Article
Road safety is one of the most important public health concerns in our society. In Spain, most road crashes involving heavy vehicles occur on two-lane rural roads. However, current road safety assessment procedures only rely on the analysis of the operating speed profile for passenger cars due to the few speed models available for heavy vehicles. T...
Article
Road safety is a major public health concern in our society. Effective road design and accurate safety analyses must be a component of programs focused on reducing and eliminating roadway injuries and deaths. Various methodologies exist to determine the expected number of crashes on rural two-lane rural roads. This research compares different proce...
Conference Paper
In recent years, the fast development of computing has fostered the use of driving simulation in road design. Simulation allows the recreation of a nonexistent road, so it can be used to enhance road alignment before its construction. However, the accurate recreation of the road and its environment establishes a real bottleneck in the implementatio...
Conference Paper
Road safety analysis is an important stage in road design, to ensure a consistent alignment and minimizing the likelihood of crash occurrence. This analysis can be directly performed by designers, or be assessed by external experts (Road Safety Audits, RSA). Traditionally, RSA are commonly based on checklists filled out by road safety experts, so d...
Article
Full-text available
Los factores más importantes en la producción de un accidente de tráfico son la infraestructura, el vehículo y el factor humano. De hecho, la interacción entre la infraestructura y el factor humano ha sido profundamente estudiada a través del concepto de consistencia del diseño geométrico, que puede definirse como el grado de adecuación entre las e...
Article
Calibration factors are applied in the Highway Safety Manual predictive method for rural two-lane, two-way roadway segments to adjust the estimate for local conditions. This research aims to evaluate and recommend improvements related to the estimation of these calibration factors. An aggregated and disaggregated analysis was performed to study the...
Article
Highway vehicles driving on rural roads account for more than 50% of all CO2 emissions produced by the transportation sector in Europe. Although the policy measures to mitigate Greenhouse Gas emissions are increasing, these do not include policies aimed at reducing emissions by means of highway geometric design, which significantly influences drive...
Article
Road crash occurrence is closely related to the geometric design consistency, which can be defined as how drivers’ expectancies and road behavior fit. To this regard, the crash rate on a road segment increases as its consistency level decreases. To assess this phenomenon, inertial consistency models were recently developed. These models are based o...
Article
Full-text available
The aim of this study is to analyze the influence of horizontal geometric design and vehicle operation on fuel consumption and gas emissions produced by passenger cars. Continuous speed data were collected along 15 two-lane rural road sections. Different horizontal alignment indexes and operational variables were obtained. Fuel consumption and gas...
Conference Paper
The use of connected and autonomous vehicles is growing every year. However, the new and better capabilities of these vehicles do not go hand in hand with the road physical capabilities, which were developed for human driving. Although vehicle manufacturers focus on the improvement of the technical features of the devices included in this type of v...
Conference Paper
Full-text available
Road safety is one of the most important public health concern in our society. In Spain, most road crashes involving heavy vehicles occur on two-lane rural roads. However, current consistency models, which allow assessing road safety on this type of road, only rely on the analysis of the operating speed profile for passenger cars due to the few spe...
Conference Paper
The use of bicycles in Spain has increased in recent years. 48% of Spaniards have a bicycle and use it with some frequency, 4 out of 10 for sport or leisure activities in a regular basis [1]. This widespread use has an impact on road facilities, both in terms of road safety and operation. Cyclists ride on rural roads in different formations: indivi...
Conference Paper
The aim of this study is to analyze the influence of horizontal geometric design and vehicle operation on fuel consumption and gas emissions produced by passenger cars. Continuous speed data were collected along 15 two-lane rural road sections. Different horizontal alignment indexes and operational variables were obtained. Fuel consumption and gas...
Article
The most important factors for road crash occurrence are infrastructure, vehicle, and human factors. In fact, infrastructure and its interaction with human factor have been thoroughly studied in recent years through geometric design consistency, which can be defined as how drivers' expectations and road behavior relate. Global consistency models we...
Article
Road crashes are mainly caused by three concurrent factors: infrastructure, vehicle, and human factors. The interaction between the infrastructure and human factors leads to the concept of geometric design consistency. Recently, a global consistency model was developed based on the difference between the inertial operating speed profile and the ope...
Conference Paper
Highway vehicles driving on rural roads account for more than 50% of all CO2 emissions produced by the transportation sector in Europe. Although the policy measures to mitigate Greenhouse Gas emissions are increasing, these do not include strategies aimed at reducing emissions through highway geometric design, which significantly influences drivers...
Article
Road safety is closely related to geometric design consistency, which is usually assessed by examining operating speed. Most consistency models only consider passenger car speeds, even though the interaction between passenger cars and heavy vehicles plays a pivotal role in road safety. This is due to the fact that there are too few models to estima...
Article
One of every four road fatalities occurs on horizontal curves of two-lane rural roads. To this regard, many studies have been undertaken to analyze the crash risk on this road element. Most of them were based on the concept of geometric design consistency, which can be defined as how drivers’ expectancies and road behavior relate. However, none of...
Article
Road crashes are mainly caused by three concurrent factors: infrastructure, vehicles, and human factors. The interaction between infrastructure and human factors leads to the concept of geometric design consistency, which can be defined as how drivers' expectations and road behavior fit. This paper presents a new global consistency model based on t...
Article
In 2014, highway vehicles accounted for 72.8% of all Greenhouse Gases emissions from transportation in Europe. In the United States (US), emissions follow a similar trend. Although many initiatives try to mitigate emissions by focusing on traffic operations, little is known about the relationship between emissions and road design. It is feasible th...
Conference Paper
Road safety is closely related to geometric design consistency, which is usually assessed by examining operating speed. Most consistency models only consider passenger car speeds, even though the interaction between passenger cars and heavy vehicles plays a pivotal role in road safety. This is due to the fact that there are too few models to estima...
Conference Paper
Road crashes are mainly caused by three concurrent factors: infrastructure, vehicle, and human factors. The interaction between the infrastructure and human factors leads to the concept of geometric design consistency. Recently, a global consistency model was developed based on the difference between the inertial operating speed profile and the ope...
Conference Paper
In 2014, road accounted for 72.8% of all GHG emissions from transportation in Europe. In USA, emissions follow a similar trend. In order to address this problem not only vehicle and fuel type should be considered, but also road design. The main objective of this study is to evaluate the impact of road horizontal alignment on CO2 emissions produced...
Conference Paper
La cantidad de estudios de seguridad vial basados en simuladores de conducción está en continuo crecimiento. En este sentido, la Universitat Politècnica de València (UPV) ha desarrollado un simulador de conducción de bajo coste: SE2RCO (Simulador para la Evaluación, Entrenamiento y Rehabilitación de Conductores). El principal objetivo de la investi...
Conference Paper
Muy diversas investigaciones previas han mostrado cómo la percepción del riesgo afecta el comportamiento de los conductores. Muchas de ellas van dirigidas a observar la diferencia de percepción entre conductores experimentados y noveles, o entre el riesgo objetivo y el percibido. Mientras que el riesgo objetivo puede ser obtenido a partir de las es...
Conference Paper
La velocidad de operación es uno de los factores más estudiados en el análisis de la seguridad vial por su relación con la siniestralidad. En la fase de explotación es relativamente sencillo calcular la velocidad de operación a partir de datos empíricos, pero, en las fases de planeamiento y de proyecto, sólo será posible estimarla. Numerosos autore...
Conference Paper
RESUMEN La velocidad de operación, definida como el percentil 85 de la distribución de velocidad de vehículos ligeros circulando en carreteras convencionales en condiciones de flujo libre, es una de las principales variables en la evaluación de la consistencia del diseño geométrico. De esta forma, los únicos vehículos considerados en el análisis so...
Article
Full-text available
Free-flow speed variation of passenger vehicles along a road segment is one of the most used factors in road safety studies, as a surrogate measure to evaluate road design consistency. Free-flow speed may be measured when a road segment is already built but must be estimated during the design phase. Several studies have been carried out to calibrat...
Article
Full-text available
The number of road safety studies that are based on driving simulators is growing significantly. The Polytechnic University of Valencia, Spain, developed a low-cost driving simulator for the assessment, training, and rehabilitation of drivers ((SERCO)-R-2). The main objective of this research was the validation of the driving simulator so that stud...
Conference Paper
The number of road safety studies that are based on driving simulators is growing significantly. The Polytechnic University of Valencia, Spain, developed a low-cost driving simulator for the assessment, training, and rehabilitation of drivers (SE2RCO). The main objective of this research was the validation of the driving simulator so that studies a...
Conference Paper
The free-flow speed variation of passenger vehicles along a road segment is one of the most used factors in road safety studies, as a surrogate measure to evaluate road design consistency. Free-flow speed may be measured when a road segment is already built, but it must be estimated during design phase. Several studies have been carried out in orde...
Article
The occurrence of road crashes depends on several factors, with design consistency (i.e., conformance of highway geometry to drivers' expectations) being one of the most important. A new consistency model for evaluating the performance of tangent-to-curve transitions on two-lane rural roads was developed. This model was based on the inertial consis...
Article
Full-text available
Los accidentes de tráfico se producen por la concurrencia de diferentes factores (factor humano, infraestructura y vehículo), siendo la infraestructura uno de los más importantes. La afección de dicho factor sobre la siniestralidad puede estudiarse mediante el concepto de consistencia del diseño geométrico. Este concepto está relacionado con la con...
Conference Paper
Full-text available
A very important tool for determining the safety level of a road alignment is the geometric design consistency evaluation. This process determines the grade of adjustment between road behavior and drivers’ expectations. Consistency and safety are related: a high consistency level will lead to lower crash rates. Global geometric design consistency m...
Conference Paper
Road crashes occurrence depends on several factors, being the design consistency one of the most important. It refers to the conformance of highway geometry to drivers’ expectations. A new consistency model for evaluating the performance of tangent-to-curve transitions at two-lane rural roads is presented. It is based on the Inertial Consistency In...

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Projects

Projects (8)
Project
Diseñar un nuevo producto para la monitorización, evaluación y predicción automática de la condición de pavimentos urbanos a partir del procesado de imágenes procedentes de sistemas de bajo coste, que permita la optimización y priorización de actuaciones de mantenimiento bajo condicionantes económicos, sociales y medioambientales.
Archived project
The main objective of this research is to study functionality and safety on two-lane rural roads.