A Statistics Based Approach for Defining Reference Trajectories on Road Sections

Cantisani, Giuseppe; Loprencipe, Giuseppe

doi:10.5539/mas.v7n9p32

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…In these areas, trajectories of different users interfere-it is particularly hazardous when different types of users (cars, bicycles, and pedestrians) interact. In recent years, several models have been developed to predict trajectories of vehicles and bicycles on a road intersection [21][22][23][24]. The comparison between the results from analytical methods and images obtained from video camera [25] data has shown no significant dispersion between the predicted and observed trajectories.…”

Section: Introductionmentioning

confidence: 99%

Safety Problems in Urban Cycling Mobility: A Quantitative Risk Analysis at Urban Intersections

Cantisani

Moretti

Barbosa

2019

Safety

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The attention to the most vulnerable road users has grown rapidly in recent decades. The experience gained reveals an important number of cyclist fatalities due to road crashes; most of which occur at intersections. In this study, dispersion of trajectories in urban intersections has been considered to identify the whole conflict area and the largest conflict areas between cars and bicycles, and the speeds have been used to calculate exposure time of cyclists and reaction time available to drivers to avoid collision. These data allow the summary approach to the problem, while a risk probability model has been developed to adopt an elementary approach analysis. A quantitative damage model has been proposed to classify each conflict point, and a probabilistic approach has been defined to consider the traffic volume and the elementary unit of exposure. The combination of damage and probability, permitted to assess the risk of crash, at the examined intersection. Three types of urban four-arm intersection, with and without bike paths, were considered. For each scheme, the authors assessed the risk of collision between the cyclist and the vehicle. The obtained results allowed the identification of the most hazardous maneuvers and highlighted that geometry and kinematics of traffic movements cannot be overlooked, when designing an urban road intersection. The strategy proposed by the authors could have a significant impact on the risk management of urban intersections. The obtained results and the proposed hazard estimation methodology could be used to design safer intersections.

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Section: Introductionmentioning

confidence: 99%

Safety Problems in Urban Cycling Mobility: A Quantitative Risk Analysis at Urban Intersections

Cantisani

Moretti

Barbosa

2019

Safety

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“…The low radius of curvature prevented the use of dowel and tie bars, which are currently used in JPCP. Indeed, in such conditions, vehicles trajectories are not regularly channeled [43] as it happens in other conditions (i.e., straight or ordinary curved track of the alignment): this means that it is impossible to put correctly the steel reinforcement, as usually it happens for airport JPCPs [44]. Moreover, an incorrect position of bars could induce severe stresses and cause the premature failure of the pavement.…”

Section: Design Of Concretementioning

confidence: 99%

Design of the First Italian Roundabout with Jointed Plain Concrete Pavement

et al. 2018

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This work presents the results of the overall design of the first Italian roundabout with jointed plain concrete pavement. The examined case study complies with current international standards and practices for geometry of roundabouts and road pavements. The construction of a concrete pavement in an urban roundabout will better manage and slow down fast vehicular flows, and increase traffic fluidity in an important junction, trafficked by heavy vehicles, where maintenance works should be reduced to avoid queues. The design of the roundabout involved several competences for: defining the geometry of the four-arm junction, designing the thickness of the jointed plain concrete pavement both on the circular crown and the arms, studying the mix design of a high resistance concrete. As regard to the pavement, the result of the study was an un-dowelled concrete pavement composed of square slabs laid on a cement concrete subbase and a granular layer. The shape of the slabs has been designed to optimize the structural performance of their material, which is a high strength concrete mix derived from an extensive laboratory test work. In general, the results summarized approaches typical of different design conditions: urban ones for traffic flow and safety needs; high-traffic ones for the chosen pavement type; airport ones for the absence of dowel and tie bars at the joints. Indeed, the article has highlighted that the design process of a concrete roundabout requires multiple analyses to consider various features and correctly re-design an existing urban junction. Its geometrical design, the structural design of the concrete pavement and the theoretical and experimental design of the concrete mix were the main phases of this process and they needed different competences to conduct comprehensive and appropriate analyses.

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“…The verification of the design accuracy includes the road consistency examination. The road consistency is the characteristic of the infrastructure that makes it suitable to meet road user expectations and implies that the geometric successive elements are coordinated in order to produce harmonious and homogeneous driver performance and to not generate incorrect and, sometimes, unsafe driving behavior [3][4][5].…”

Section: Introduction 1context and Aim Of The Workmentioning

confidence: 99%

Procedure for the Identification of Existing Roads Alignment from Georeferenced Points Database

Cantisani

Serrone

2020

Infrastructures

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The aim of this research is to look for an automated, economical and fast method able to identify the elements of an existing road layout, whose original geometric design could date back to distant ages and could have undergone major modifications over the years. The analysis has been directed towards the Italian two-lane rural roads; the national public company ANAS made available its graph, obtained from high-performance surveys, that represents about 90% of these roads’ network. The graph is made up of a collection of georeferenced points but does not recognize or describe the geometric elements making up the roadway. Consequently, it has been necessary to design and develop an original procedure, subsequently implemented in a programming platform, able to identify the characteristics of the several parts, which constitute the reference axes of the existing roads. This research focuses on the horizontal geometry assessing the coherence, consistency and homogeneity of the roads’ layout, through the ex post application of the regulatory model for the design verification. If road sections are identified in which some conditions are not significantly met, further investigation should be conducted in order to ensure road safety and to plan any road upgrading activities.

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A Statistics Based Approach for Defining Reference Trajectories on Road Sections

Cited by 7 publications

References 25 publications

Safety Problems in Urban Cycling Mobility: A Quantitative Risk Analysis at Urban Intersections

Safety Problems in Urban Cycling Mobility: A Quantitative Risk Analysis at Urban Intersections

Design of the First Italian Roundabout with Jointed Plain Concrete Pavement

Procedure for the Identification of Existing Roads Alignment from Georeferenced Points Database

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