Salvatore Leonardi

Salvatore Leonardi
University of Catania | UNICT · Department of Civil Engineering and Architecture (DICAR)

About

67
Publications
45,247
Reads
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287
Citations
Citations since 2017
31 Research Items
258 Citations
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2017201820192020202120222023020406080
2017201820192020202120222023020406080

Publications

Publications (67)
Article
Full-text available
The speed value of 30 km/h should not be exceeded in urban areas, both to ensure safety requirements for all categories of users and to improve the overall quality of life in urban areas. Moreover, it is necessary not only to comply with the prescribed maximum speed, but also to ensure a uniform speed by limiting the variations in relation to the a...
Article
Full-text available
Roundabouts have become a common type of intersection design in many countries. The area of the center island can be used to install a photovoltaic system to power local loads such as lighting systems. The objective of this study is to evaluate the degree of self-sufficiency that a roundabout can achieve depending on the availability of the area fo...
Article
Full-text available
This paper poses the question of the redesign of urbanized arterial roads following a multi-objective approach. These infrastructures usually have wide lanes that allow high speeds and low safety conditions, resulting in the roads with the highest accident rates in suburban areas. However, since they experienced a rapid urbanization, they need to b...
Article
Full-text available
Longer life expectancy is leading to an increase in the average age of the European population. In 2018, 20% of the population was over 65 years old. In 2070, 30.3% of the population will be over 65. Older people prefer to walk in their neighborhoods but they rely on cars as their primary mode of transportation, which allows them to maintain their...
Article
Full-text available
A model is proposed for allocating safety resources to various hazard sites. Due to budget constraints, allocation of resources for necessary countermeasures is a critical issue in safety improvement programs. Therefore, the Decision Maker needs a tool that can prioritize the identified countermeasures looking at several objectives, the most import...
Article
Full-text available
It is commonly acknowledged that the human factor and the interaction between the human factor and the road environment are among the most common causes of road accidents. Physiological signals can provide a real-time assessment of the driver's state because they can be collected continuously without interfering with the driver's task performance o...
Conference Paper
Full-text available
Studies looking at roundabout safety have generally focused on drivers, overlooking the importance of the safety of vulnerable users such as pedestrians. Crosswalks at roundabouts are useful for pedestrians and increase safety. They should be placed to attract the maximum number of pedestrians, who would otherwise cross the road haphazardly. In thi...
Chapter
Full-text available
The accessibility of urban contexts is closely connected to analysis of geometric and functional details that can influence the actions of road vulnerable users. The correct design of the spaces and their accessibility must consider all age groups and problems related not only to safety but also to perception and comfortable movement. This research...
Chapter
Even though roundabouts have been shown to provide significant safety and operational benefits, they generally are more complex and difficult to navigate than most other road segments. This study intends to contribute for a better understanding of the factors affecting the drivers’ unsafe behaviours at single-lane roundabouts. Unsafe behaviours are...
Article
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This study investigated the nature and causes of unsafe driving behavior at roundabouts through an on-road study. Four urban double-lane roundabouts with different layouts were selected for an on-road study. Sixty-six drivers (41 males and 25 females) aged 18–65 years took part in the study. Unsafe behaviors observed during the in situ survey were...
Article
Although converting an intersection into a roundabout has been shown to result in fewer injury accidents for both motor vehicle drivers and pedestrians, the effect on bicyclists’ safety is unclear or even negative. This study focuses on roundabouts without bicycle facilities (i.e., mixed traffic conditions) and makes use of semi-automated video obs...
Article
Full-text available
Introduction: Pedestrians aged over 65 are known to be a critical group in terms of road safety because they represent the age group with the highest number of fatalities or injured people in road accidents. With a current ageing population throughout much of the developed world, there is an imminent need to understand the current transportation re...
Article
The benefits of mobility in later life and active ageing have been widely documented and evidenced. Despite its clear benefits, physical activity levels among older people fall short of recommended levels. Older people can have feelings of fear when walking in the outdoor environment. In order to facilitate mobility in later life, it is important t...
Article
Full-text available
Safety is one of the International Civil Aviation Organization's (ICAO) strategic objectives to foster a global civil aviation system. Statistically, almost 40% of aviation accidents occur at airports, the most frequent type is runway excursion. The assessment of accident severity is an essential part of safety assessment methods. In this study, a...
Article
Full-text available
Road traffic injuries claim more than 1.2 million lives each year in the world and have a huge impact on health and development. It is commonly acknowledged that the human factor and the interaction between the human factor and the road environment are among the most common causes of road accidents. Intersections are among the most complex road env...
Article
Full-text available
Pedestrians aged over 65 are known to be a critical group in terms of road safety because they represent the age group with the highest number of fatalities or injured persons in road accidents. It is therefore important to identify and characterize how old pedestrians perceive pedestrian paths with respect to their age related declines in perceptu...
Article
Full-text available
Roundabouts have been shown to provide significant safety and operational benefits, but a better understanding of public perceptions of roundabouts is critical in order to assess the contribution of the driving behavior of the users on their safety. Therefore, research on user behavior and preferences is a helpful tool in improving road safety and...
Poster
Full-text available
Background: Today, roundabouts are an integral part of the road system. Roundabouts, like all intersections, are complex road environments: their geometric configuration, the signs and markings, the road furniture, the qualitative and quantitative characteristics of traffic, the vehicular conflicts are all elements which weigh the driver workload,...
Article
Full-text available
It is now known that roundabouts offer high levels of safety, but different researches on this type of intersection show that several factors influence the driver’s behavior, causing occasionally wrong driving behaviors that can degenerate into accidents. Understanding driver’s preferences is an important goal in order to encourage an efficient and...
Article
Full-text available
Risk perception, i.e. the ability to "read the road" in relation to potentially dangerous situations in the traffic environment, is strongly related to accident involvement. Human driving behavior is strongly conditioned by the road environment in its entirety, as driving involves complex interactions between the driver and the environment. This st...
Article
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Vehicle speed is one of the main risk factors for road traffic safety. To increase the level of road safety, especially in urban areas, measures must be implemented to reduce vehicle speed. The installation of calming measures on a road network is systematically planned way to reduce driving speeds. This paper studies the effectiveness in terms of...
Article
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Roundabouts can provide benefits in many ways. They are safer, more efficient, less costly and more aesthetically appealing than standard at-grade intersections (controlled and signalized). The administrations have often identified roundabouts as a proven safety countermeasure for the following reasons: a) reduce overall conflict points and remove...
Article
Full-text available
Pedestrian injury is a major hazard to the health of children in most developed countries. Pedestrian accidents are one of the first causes of injury-related deaths and hospitalizations among children aged 5 to 14 in industrialized countries. This study has a dual objective: 1) to identify the factors affecting Italian parents' propensity to use pr...
Article
Full-text available
Purpose The risk of aircraft runway excursion, dependent on multiple factors, is related to operating conditions. The purpose of this paper is to identify the correspondence between features belonging to different aspects that occur in runway excursion events, distinguishing between take-off and landing phases. Design/methodology/approach To defin...
Poster
Full-text available
Pedestrian injury is a major hazard to the health of children in most developed countries. Pedestrian accidents in Italy are one of the first causes of injury-related deaths for children aged 5 to 14 years old in industrialized countries. This study has a dual objective: 1) to identify the factors affecting the parents' propensity to use private ca...
Article
Full-text available
The aim of this paper is to identify the roundabout geometric characteristics affecting the safety perception while the typical maneuvers (entry, circulation, exit) are being carried out. The tool used was an on-line questionnaire, filled out by about 1.650 respondents. Four different dimensionality reduction methods (Cluster Analysis, Corresponden...
Conference Paper
Objectives: The aim is to evaluate the effectiveness, in order to speed reduction, of three traffic calming measures: 1) speed table, 2) chicane, 3) road narrowing. Prior Work: Many researches show the effectiveness in reducing the speed of the traffic calming measures. To this effect, field measurements were made on street sections with different...
Article
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The term ‘scenario’ is used in the safety field to designate a prototype or a model of an accident process characterised by chains of facts, actions, causal relations and consequences in terms of damage to people and property. The prototypical scenarios, properly realized, provide a basis on which to consider the action to be taken, but also a conc...
Article
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U-turn lanes eliminate left turns at intersections and allow the manoeuvre to be made via median crossovers beyond the intersection. However, there are many situations where road infrastructures are characterized by the reduced width of the median. It is clear that, in such situations, we must adopt design criteria that take into account limitation...
Article
Full-text available
More than one accident of three that involve pedestrians in urban area occurs at road intersections. The users’ inproper behaviour, the geometrical characteristics of the intersections, and the high speeds of vehicles are the main causes of pedestrian accidents. In this field, the procedures of road safety analysis (Road Safety Audit and Road Safet...
Article
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It is known that speed bumps are devices capable of reducing the speed of vehicles (traffic calming measures). Bumps arranged in sequence are capable of inducing a speed regime almost constant along the road sections in which they are installed. However, the impact of vehicles on the bumps generates noise that is annoying to residents. Many studies...
Article
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A practical problem in air transport is how to manage risk and safety. In recent years have been developed special technical and managerial skills to the systematic, forward looking identification and control of hazards throughout the life cycle of a project, program, or activity. Safety Management System (SMS) involves identifying, evaluating, and...
Article
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The ISAT algorithm (Interchange Safety Analysis Tool), developed by the Federal Highway Administration (FHWA), provides design and safety engineers with an automated tool for assessing the safety effects of geometric design and traffic control features at an existing interchange and adjacent roadway network. Concerning the default calibration coeff...
Article
Full-text available
Nowadays, Road Safety Inspections (RSI) are recognized as an effective tool for identifying safety deficiencies of road infrastructures. They represent a low cost process for the evaluation of the network safety performance. Its applicability in rural local roads, where accident data generally do not give enough information for the safety analysis,...
Article
Full-text available
Synopsis Today, the overall yearly number of accidents, incidents and serious incidents in civil aviation is some 50 worldwide, with an average of 13000 victims. Experience has demonstrates that before an accident occurs various incidents and numerous failures reveal the existence of safety risks. In this context, risk assessment and risk managemen...
Article
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1. PREMESSE Nell'ambito dell'attività di ricerca condotta presso il Dipartimento di Ingegneria Civile e Ambientale (Sezione: Ingegneria delle Infrastrutture Viarie e dei Trasporti) dell'Università degli Studi di Catania, si è da tempo avviato un filone di studio relativo alla sicurezza stradale. In particolare, da qualche anno, ci si è mossi verso...
Article
Full-text available
SOMMARIO Le rotatorie e, in particolare, le mini-rotatorie presenti in ambito urbano, manifestano una peculiarità di notevole rilievo: il miglioramento delle caratteristiche di sicurezza rispetto alle altre tipologie di intersezione (semaforizzate o regolate dai segnali di stop o di dare precedenza); tale incremento di sicurezza, evidenziato dai da...
Article
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1. PREMESSE Fra le problematiche più interessanti inerenti alla sicurezza in campo aeroportuale, merita particolare attenzione la pericolosità associata alle manovre "a terra" dei velivoli (decollo e atterraggio). In tale contesto, la rilevazione del coefficiente di aderenza µ rappresenta una delle funzioni specifiche degli interventi mirati alla s...
Article
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1. PREMESSE. Lo studio della pericolosità di un tracciato stradale non può prescindere dall'analisi del comportamento umano. L'uomo, infatti, rappresenta l'unico fattore che è in grado di modificare ed adattare il proprio comportamento di guida alle condizioni della strada, dell'ambiente e del proprio veicolo. La condotta di guida è basata su una s...
Article
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Rural roundabouts present an important quality: the improvement of the safety characteristics with respect to other intersection typologies of intersection at grade. With the present paper, we want to propose a general methodology which, basing on a series of inputs (geometry, vehicular flows, operative speeds), allows to characterize the performan...
Article
Full-text available
Synopsis Road intersection reliability depends on several factors, between which road lighting assumes particular importance. This must reveal the presence of intersection, the directions of the confluent and diverging roads, the position of the sidewalks, the presence of pedestrians and other customers, the obstructions, the movement of the vehicl...
Article
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1. PREMESSA Gli indicatori del livello di servizio degli utenti stradali possono essere collegati alle caratteristiche di sicurezza, comfort, e costo del trasporto delle infrastrutture stradali. Lo studio del moto di un veicolo deve essere analizzato mediante la analisi complessiva del sistema strada veicolo. Le infrastrutture stradali possono esse...
Article
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SOMMARIO L'eccessivo incremento di traffico veicolare sulla rete stradale italiana genera non pochi problemi inerenti alla sicurezza del viaggio, soprattutto in quelle zone ove si manifesta la combinazione tra il degrado strutturale e l'elevato carico veicolare. Il compito degli amministratori è quello di mantenere alto il livello di funzionalità d...
Article
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The G.I.S. technology can correlate different types of information. Today, it could be used for the management of the highways, which must guarantee an elevated speed and safety of the vehicular flow. Often the highway become very dangerous especially when there is much traffic. In the present work we will show a project of variable message sign th...
Article
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SOMMARIO I risultati di molte ricerche condotte a livello internazionale evidenziano come la geometria verticale influisca significativamente sul grado di sicurezza dei tracciati stradali. Si è visto, in particolare, come le condizioni più gravose si manifestino sui tratti in discesa a causa dell'accentuarsi della velocità di marcia degli utenti. V...