vittorio astarita - Academia.edu (original) (raw)
Papers by vittorio astarita
The European Commission has recently promoted research programs aimed at finding solutions to the... more The European Commission has recently promoted research programs aimed at finding solutions to the ever more compelling problem of air pollution from road vehicles and has also indicated among the possible impacts of cooperative Intelligent transportation a better sustainability, by cutting down pollutant emissions and reducing consumptions. In fact many practical solutions will develop that allow drivers and managements to optimize resources and to contain costs and the emissions of pollutants by applying communication systems between vehicles (V2V) and between vehicles and infrastructure (V2I). Along this mainstream this paper present a cooperative system which offer drivers the ability to manage their consumption and driving style, suggesting corrections to the behavior usually adopted. The new contribution of this paper is the cooperative approach between drivers to achieve a common goal of a better common energy consumption strategy. Since the fuel consumption has to be evaluated with regards to the specific vehicle type the system is based also on crowdsourcing of the specific vehicle consumption performances. The paper describes a system that gathers data on fuel consumption from the cooperating drivers that by can build together the data set necessary to the system itself and accept this new paradigm: crowd sourced cooperation for a better world.
Applied Mechanics and Materials, May 12, 2014
A traffic assignment model is presented that simulates the process of users' choice in a day-... more A traffic assignment model is presented that simulates the process of users' choice in a day-to-day dynamic framework and also the traffic dynamics "within" each single simulated day. It can therefore be considered a doubly dynamic model, being day-to-day dynamic to represent user path choice and within-day dynamic to represent user movement on the network. The model has fixed departure times; origin-destination demand flows are assumed known at each interval within the simulated period. Path choice behavior is modeled considering explicitly learning or information updating processes for experienced path costs. The users' choice adjustment process takes into account the inertia to day-to-day path changes. Path choices are simulated by applying a C-logit random utility model, that allows the effects of links shared between similar paths to be simulated, keeping an analytical expression of choice probability. The Network Flow Propagation model adopted in the dynamic ...
Diversi algoritmi per l’estrazione delle traiettorie veicolari tramite i sistemi di acquisizione ... more Diversi algoritmi per l’estrazione delle traiettorie veicolari tramite i sistemi di acquisizione video sono stati sviluppati e implementati in sistemi software commerciali, come AutoScope, Citilog e Traficon. Questi sistemi utilizzano un approccio a spira virtuale in grado di fornire informazioni sul traffico utili per la gestione e il controllo, ma non per il rilevamento di traiettorie. Altri sistemi, come il PEEK Video Trak-IQ e NGSIM-Video, utilizzano un approccio di tracciamento dei veicoli e devono essere accuratamente calibrati prima della loro applicazione. Tutti questi sistemi presentano diversi problemi in fase di rilevamento delle traiettorie veicolari: errori di misura causati dalla congestione del traffico, da vibrazioni della videocamera, da occlusione parziale o totale della visuale, da variazioni di illuminazione. Gli algoritmi per il tracciamento delle traiettorie veicolari da immagini video possono essere classificati in tre categorie: algoritmi basati sul riconosci...
In the last years the growing need for a better mobility has coincided with an increase of conges... more In the last years the growing need for a better mobility has coincided with an increase of congestion levels on transportation infrastructures and a consequent repercussion on safety aspects. For this reason researchers and technicians have focused on the study of safety performances on road networks identifying and applying all kinds of countermeasures useful to decrease accident risks. One of the most common methodologies to estimate safety makes use of inferential statistics applied to crash databases in what can be considered as a reactive approach to the problem. Although this method seems to intuitively link causes to effects, a good knowledge of the dynamics of the events preceding the crash may provide a more useful support to the implementation of appropriate countermeasures. Moreover, the problems of consistency and availability of crash data as well as the methodological challenges posed by the extremely random nature and the uniqueness of accidents have led to the develo...
This paper describes a toll road payment and control system in which a mobile device (for example... more This paper describes a toll road payment and control system in which a mobile device (for example mobile phones or tablets, etc) is used as payment device, instead of more complicated and expensive systems. The phone can allow users to start and end the trip of a vehicle inside toll areas. The system follows the current trends of moving most daily communications and transactions on mobile devices such as smartphones that today represent an almost indispensable tool. With the use of a simple dedicated application, (installed on the user’s mobile device), the user can start certification of payment at the beginning of the trip time. The application, based on user inputs, acts as an electronic ticket and certifies the use of the service and concurrently the payment, testifying, to any roadside inspection, the actual payment of the trip. The system has many advantages and among them the easy implementation in any urban context, moreover the system proposed is absolutely original as it a...
A partire dal 2009, l'Università della Calabria ha sviluppato Tritone, un microsimulatore di ... more A partire dal 2009, l'Università della Calabria ha sviluppato Tritone, un microsimulatore di reti stradali capace di prevedere, oltre che l'evoluzione del traffico, le possibili aree di una rete stradale a maggior rischio di incidenti. Tritone è in grado di rappresentare in maniera puntuale, precisa e specifica il traffico, la sua evoluzione istantanea e le situa-zioni di rischio, prendendo in considerazione gli aspetti geometrici di dettaglio dell'infrastruttura ed il comportamento reale dei conducenti esaminando nel dettaglio l'accoppiamento delle caratteristiche del veicolo e del guidatore. Tritone nasce con lo scopo di diventare uno strumento di punta nel settore della sicurezza stradale, perché non solo è effi-ciente funzionalmente e dal punto di vista dell'usabilità, ri-specchiando a pieno le nuove tendenze di una interfaccia utente user-friendly, ma permette anche di valutare automaticamente e dinamicamente molti parametri di sicurezza stradale come gli in...
La problematica principale di ogni strada è rappresentata principalmente dalla presenza di anomal... more La problematica principale di ogni strada è rappresentata principalmente dalla presenza di anomalie sulla pavimentazione che comportano una riduzione della sua efficienza e un maggiore rischio in termini di sicurezza stradale. Queste tematiche sono affrontate oggi dalla comunità scientifica in maniera differente rispetto al passato. I primi risultati riguardo l’uso di nuove tecnologie applicate alla rilevazione delle buche stradali sono stati ottenuti dal progetto StreetBump [1] di Boston (USA). Contemporaneamente in Italia, presso il Dipartimento di Ingegneria Civile dell’Università della Calabria, si sono sviluppate metodologie simili per il monitoraggio della qualità della pavimentazione stradale [2, 3] e il successivo rilevamento di punti critici [4] attraverso l’uso combinato di più sensori presenti all’interno dei comuni smartphones. TutorDrive rappresenta uno dei pochi esempi di applicazione self-aware presenti Europa. Con tale termine si identifica una speciale categoria di ...
Proceedings of 2014 IEEE International Conference on Service Operations and Logistics, and Informatics, 2014
The European Commission has recently promoted research programs aimed at finding solutions to the... more The European Commission has recently promoted research programs aimed at finding solutions to the ever more compelling problem of air pollution from road vehicles and has also indicated among the possible impacts of cooperative Intelligent transportation a better sustainability, by cutting down pollutant emissions and reducing consumptions. In fact many practical solutions will develop that allow drivers and managements to optimize resources and to contain costs and the emissions of pollutants by applying communication systems between vehicles (V2V) and between vehicles and infrastructure (V2I). Along this mainstream this paper present a cooperative system which offer drivers the ability to manage their consumption and driving style, suggesting corrections to the behavior usually adopted. The new contribution of this paper is the cooperative approach between drivers to achieve a common goal of a better common energy consumption strategy. Since the fuel consumption has to be evaluated with regards to the specific vehicle type the system is based also on crowdsourcing of the specific vehicle consumption performances. The paper describes a system that gathers data on fuel consumption from the cooperating drivers that by can build together the data set necessary to the system itself and accept this new paradigm: crowd sourced cooperation for a better world.
Qualche anno fa è stata avviata una ricerca congiunta tra l’Università della Calabria (Italia) e ... more Qualche anno fa è stata avviata una ricerca congiunta tra l’Università della Calabria (Italia) e il Politechnika Poznańska (Polonia) allo scopo di effettuare degli studi sulla differenza di risposta di vari modelli di simulazione del traffico stradale. Uno di questi studi ha riguardato la comparazione di 12 diversi modelli comportamentali di car-following, disponibili in TRITONE, un simulatore di traffico stradale specializzato nella valutazione di problemi legati alla sicurezza stradale. Il problema nasce dal fatto che una riproduzione affidabile del traffico veicolare non è un problema banale, in quanto finora sono stati proposti molti modelli matematici per la risoluzione di tali problemi, ma nessuno di loro può realmente essere considerato come migliore di un altro. Il lavoro ha previsto lo studio di una parte della rete stradale della città di Poznan (Polonia) in cui il traffico è maggiore nelle ore pomeridiane.
Proceedings of 2013 IEEE International Conference on Service Operations and Logistics, and Informatics, 2013
This article presents a technique for the detection of road surfaces problems through the measure... more This article presents a technique for the detection of road surfaces problems through the measurement of sound pressure levels inside the vehicle. While knowledge on the mechanisms behind the modeling of the noise produced by vehicles in the urban environment is growing, its perception by the driver remains relatively unexplored. In this study is defined a methodology, that allows to identify road bumps and potholes through sound level and simultaneous geolocation of vehicle tracks, is defined. The methodology has been applied on a test site characterized by the presence of a series of road speed bumps geometrically precisely defined. A series of experiments on the circuit test have been carried out with different sound level meter instrumentations synchronized with a GPS device. All experiments have been replicated on two different types of vehicle. All data acquired by the devices and loaded on a geographic information system have been processed for the validation of the methodology. This methodology uses a simple and widespread instrumentation and unlike other methodologies, it does not need specific instruments which must be specifically positioned in the vehicle. In fact, this methodology was applied just by using the built-in microphone of the most common world smartphones market.
Procedia Computer Science, 2014
An increasingly important issue, as congestion levels increase more and more, is that freeways be... more An increasingly important issue, as congestion levels increase more and more, is that freeways become subject to rebuilding and restructuring when traffic cannot be re-routed. It has already been asserted that traffic simulation provides a better approach to the analysis of freeway reconstruction than the traditional Highway Capacity Manual. In fact the users' delay on freeway under reconstruction, when traffic flow is under capacity, cannot be evaluated by the standard HCM procedures. The impacts on existing traffic patterns are significant: the costs of delay and safety suffered by users even for low flows requires to take adequate management actions. From the point of view of direct reconstruction costs, every attempt to reduce user cost brings an increase in the direct costs of rebuilding. So there is a clear trade-off between reducing direct costs and mitigating the costs to travellers and economic activities. The object of this paper is to allow the evaluation of the delay that is suffered by the users of two-lane freeways when only one lane is available. The delays for different flow levels and different lengths of the reconstruction area are evaluated with the use of a tailored new developed microscopic traffic simulation model.
Transportation Research Record, 2001
Interest in the temporal modeling of road traffic has increased over the past decade due to the n... more Interest in the temporal modeling of road traffic has increased over the past decade due to the need to model traffic dynamics for the purpose of evaluating a variety of ITS components, such as traffic control measures and route guidance. A number of different approaches are available, including macroscopic, mesoscopic and microscopic traffic models, as well as analytical dynamic assignment models. Although microscopic models are the most detailed and realistic, they are difficult to calibrate and may not be the most practical tools for large-scale networks. This paper investigates three methods for dynamic network loading that are considerably less detailed than microscopic modeling. Each of the three methods is based on a different approach to modeling traffic dynamics: link-based travel time functions, the celltransmission model, and a link-based model derived from a simplified car-following relationship. A small test network was devised and the results from each model were compared to those obtained with a microsimulator . Interpretation of the discrepancies observed in the results gave some indication of the relative importance of the different components of the three traffic models presented.
Proceedings of 2014 IEEE International Conference on Service Operations and Logistics, and Informatics, 2014
ABSTRACT This article show a methodology for the identification of road anomalies through the cou... more ABSTRACT This article show a methodology for the identification of road anomalies through the coupled measurements of vertical acceleration and sound pressure levels. The innovative solution of this methodology lays in the possibility to evaluate road anomalies by using the time derivative of acceleration and sound pressure. Furthermore, this methodology has been developed and validated using a commercially available instrumentation possessed by most drivers, such as, smartphones and tablets. The current smartphone devices, in fact, are equipped with GPS, gyroscope and microphone that allow to simultaneously record data relating to geolocation, acceleration and sound pressure. The widespread distribution of this equipment could allow local administration to acquire a large number of surveys carried out by normal drivers and build a large Data Base on road anomalies representative of a whole network of infrastructures with a very small cost. Finally, the application of the methodology overturns current monitoring policies of road infrastructure that can be carried out only by the management staff by crowdsourcing the DB system with continuous real time updates brought by normal road users.
In this paper the problem of defining the analytical rules that govern flows at an intersection n... more In this paper the problem of defining the analytical rules that govern flows at an intersection node is addressed. This problem pertains to flow based Dynamic Network Loading (DNL) models that consider the spill-back of queues. The limited resource of flow supply on the downstream links, of such a node, has to be distributed between users in a proper way. The problem can be expressed as a linear programming problem, where the objective is to maximize the total flow crossing the node at each time t, and the constraints are the local supplies and demands at the node.
The European Commission has recently promoted research programs aimed at finding solutions to the... more The European Commission has recently promoted research programs aimed at finding solutions to the ever more compelling problem of air pollution from road vehicles and has also indicated among the possible impacts of cooperative Intelligent transportation a better sustainability, by cutting down pollutant emissions and reducing consumptions. In fact many practical solutions will develop that allow drivers and managements to optimize resources and to contain costs and the emissions of pollutants by applying communication systems between vehicles (V2V) and between vehicles and infrastructure (V2I). Along this mainstream this paper present a cooperative system which offer drivers the ability to manage their consumption and driving style, suggesting corrections to the behavior usually adopted. The new contribution of this paper is the cooperative approach between drivers to achieve a common goal of a better common energy consumption strategy. Since the fuel consumption has to be evaluated with regards to the specific vehicle type the system is based also on crowdsourcing of the specific vehicle consumption performances. The paper describes a system that gathers data on fuel consumption from the cooperating drivers that by can build together the data set necessary to the system itself and accept this new paradigm: crowd sourced cooperation for a better world.
Applied Mechanics and Materials, May 12, 2014
A traffic assignment model is presented that simulates the process of users' choice in a day-... more A traffic assignment model is presented that simulates the process of users' choice in a day-to-day dynamic framework and also the traffic dynamics "within" each single simulated day. It can therefore be considered a doubly dynamic model, being day-to-day dynamic to represent user path choice and within-day dynamic to represent user movement on the network. The model has fixed departure times; origin-destination demand flows are assumed known at each interval within the simulated period. Path choice behavior is modeled considering explicitly learning or information updating processes for experienced path costs. The users' choice adjustment process takes into account the inertia to day-to-day path changes. Path choices are simulated by applying a C-logit random utility model, that allows the effects of links shared between similar paths to be simulated, keeping an analytical expression of choice probability. The Network Flow Propagation model adopted in the dynamic ...
Diversi algoritmi per l’estrazione delle traiettorie veicolari tramite i sistemi di acquisizione ... more Diversi algoritmi per l’estrazione delle traiettorie veicolari tramite i sistemi di acquisizione video sono stati sviluppati e implementati in sistemi software commerciali, come AutoScope, Citilog e Traficon. Questi sistemi utilizzano un approccio a spira virtuale in grado di fornire informazioni sul traffico utili per la gestione e il controllo, ma non per il rilevamento di traiettorie. Altri sistemi, come il PEEK Video Trak-IQ e NGSIM-Video, utilizzano un approccio di tracciamento dei veicoli e devono essere accuratamente calibrati prima della loro applicazione. Tutti questi sistemi presentano diversi problemi in fase di rilevamento delle traiettorie veicolari: errori di misura causati dalla congestione del traffico, da vibrazioni della videocamera, da occlusione parziale o totale della visuale, da variazioni di illuminazione. Gli algoritmi per il tracciamento delle traiettorie veicolari da immagini video possono essere classificati in tre categorie: algoritmi basati sul riconosci...
In the last years the growing need for a better mobility has coincided with an increase of conges... more In the last years the growing need for a better mobility has coincided with an increase of congestion levels on transportation infrastructures and a consequent repercussion on safety aspects. For this reason researchers and technicians have focused on the study of safety performances on road networks identifying and applying all kinds of countermeasures useful to decrease accident risks. One of the most common methodologies to estimate safety makes use of inferential statistics applied to crash databases in what can be considered as a reactive approach to the problem. Although this method seems to intuitively link causes to effects, a good knowledge of the dynamics of the events preceding the crash may provide a more useful support to the implementation of appropriate countermeasures. Moreover, the problems of consistency and availability of crash data as well as the methodological challenges posed by the extremely random nature and the uniqueness of accidents have led to the develo...
This paper describes a toll road payment and control system in which a mobile device (for example... more This paper describes a toll road payment and control system in which a mobile device (for example mobile phones or tablets, etc) is used as payment device, instead of more complicated and expensive systems. The phone can allow users to start and end the trip of a vehicle inside toll areas. The system follows the current trends of moving most daily communications and transactions on mobile devices such as smartphones that today represent an almost indispensable tool. With the use of a simple dedicated application, (installed on the user’s mobile device), the user can start certification of payment at the beginning of the trip time. The application, based on user inputs, acts as an electronic ticket and certifies the use of the service and concurrently the payment, testifying, to any roadside inspection, the actual payment of the trip. The system has many advantages and among them the easy implementation in any urban context, moreover the system proposed is absolutely original as it a...
A partire dal 2009, l'Università della Calabria ha sviluppato Tritone, un microsimulatore di ... more A partire dal 2009, l'Università della Calabria ha sviluppato Tritone, un microsimulatore di reti stradali capace di prevedere, oltre che l'evoluzione del traffico, le possibili aree di una rete stradale a maggior rischio di incidenti. Tritone è in grado di rappresentare in maniera puntuale, precisa e specifica il traffico, la sua evoluzione istantanea e le situa-zioni di rischio, prendendo in considerazione gli aspetti geometrici di dettaglio dell'infrastruttura ed il comportamento reale dei conducenti esaminando nel dettaglio l'accoppiamento delle caratteristiche del veicolo e del guidatore. Tritone nasce con lo scopo di diventare uno strumento di punta nel settore della sicurezza stradale, perché non solo è effi-ciente funzionalmente e dal punto di vista dell'usabilità, ri-specchiando a pieno le nuove tendenze di una interfaccia utente user-friendly, ma permette anche di valutare automaticamente e dinamicamente molti parametri di sicurezza stradale come gli in...
La problematica principale di ogni strada è rappresentata principalmente dalla presenza di anomal... more La problematica principale di ogni strada è rappresentata principalmente dalla presenza di anomalie sulla pavimentazione che comportano una riduzione della sua efficienza e un maggiore rischio in termini di sicurezza stradale. Queste tematiche sono affrontate oggi dalla comunità scientifica in maniera differente rispetto al passato. I primi risultati riguardo l’uso di nuove tecnologie applicate alla rilevazione delle buche stradali sono stati ottenuti dal progetto StreetBump [1] di Boston (USA). Contemporaneamente in Italia, presso il Dipartimento di Ingegneria Civile dell’Università della Calabria, si sono sviluppate metodologie simili per il monitoraggio della qualità della pavimentazione stradale [2, 3] e il successivo rilevamento di punti critici [4] attraverso l’uso combinato di più sensori presenti all’interno dei comuni smartphones. TutorDrive rappresenta uno dei pochi esempi di applicazione self-aware presenti Europa. Con tale termine si identifica una speciale categoria di ...
Proceedings of 2014 IEEE International Conference on Service Operations and Logistics, and Informatics, 2014
The European Commission has recently promoted research programs aimed at finding solutions to the... more The European Commission has recently promoted research programs aimed at finding solutions to the ever more compelling problem of air pollution from road vehicles and has also indicated among the possible impacts of cooperative Intelligent transportation a better sustainability, by cutting down pollutant emissions and reducing consumptions. In fact many practical solutions will develop that allow drivers and managements to optimize resources and to contain costs and the emissions of pollutants by applying communication systems between vehicles (V2V) and between vehicles and infrastructure (V2I). Along this mainstream this paper present a cooperative system which offer drivers the ability to manage their consumption and driving style, suggesting corrections to the behavior usually adopted. The new contribution of this paper is the cooperative approach between drivers to achieve a common goal of a better common energy consumption strategy. Since the fuel consumption has to be evaluated with regards to the specific vehicle type the system is based also on crowdsourcing of the specific vehicle consumption performances. The paper describes a system that gathers data on fuel consumption from the cooperating drivers that by can build together the data set necessary to the system itself and accept this new paradigm: crowd sourced cooperation for a better world.
Qualche anno fa è stata avviata una ricerca congiunta tra l’Università della Calabria (Italia) e ... more Qualche anno fa è stata avviata una ricerca congiunta tra l’Università della Calabria (Italia) e il Politechnika Poznańska (Polonia) allo scopo di effettuare degli studi sulla differenza di risposta di vari modelli di simulazione del traffico stradale. Uno di questi studi ha riguardato la comparazione di 12 diversi modelli comportamentali di car-following, disponibili in TRITONE, un simulatore di traffico stradale specializzato nella valutazione di problemi legati alla sicurezza stradale. Il problema nasce dal fatto che una riproduzione affidabile del traffico veicolare non è un problema banale, in quanto finora sono stati proposti molti modelli matematici per la risoluzione di tali problemi, ma nessuno di loro può realmente essere considerato come migliore di un altro. Il lavoro ha previsto lo studio di una parte della rete stradale della città di Poznan (Polonia) in cui il traffico è maggiore nelle ore pomeridiane.
Proceedings of 2013 IEEE International Conference on Service Operations and Logistics, and Informatics, 2013
This article presents a technique for the detection of road surfaces problems through the measure... more This article presents a technique for the detection of road surfaces problems through the measurement of sound pressure levels inside the vehicle. While knowledge on the mechanisms behind the modeling of the noise produced by vehicles in the urban environment is growing, its perception by the driver remains relatively unexplored. In this study is defined a methodology, that allows to identify road bumps and potholes through sound level and simultaneous geolocation of vehicle tracks, is defined. The methodology has been applied on a test site characterized by the presence of a series of road speed bumps geometrically precisely defined. A series of experiments on the circuit test have been carried out with different sound level meter instrumentations synchronized with a GPS device. All experiments have been replicated on two different types of vehicle. All data acquired by the devices and loaded on a geographic information system have been processed for the validation of the methodology. This methodology uses a simple and widespread instrumentation and unlike other methodologies, it does not need specific instruments which must be specifically positioned in the vehicle. In fact, this methodology was applied just by using the built-in microphone of the most common world smartphones market.
Procedia Computer Science, 2014
An increasingly important issue, as congestion levels increase more and more, is that freeways be... more An increasingly important issue, as congestion levels increase more and more, is that freeways become subject to rebuilding and restructuring when traffic cannot be re-routed. It has already been asserted that traffic simulation provides a better approach to the analysis of freeway reconstruction than the traditional Highway Capacity Manual. In fact the users' delay on freeway under reconstruction, when traffic flow is under capacity, cannot be evaluated by the standard HCM procedures. The impacts on existing traffic patterns are significant: the costs of delay and safety suffered by users even for low flows requires to take adequate management actions. From the point of view of direct reconstruction costs, every attempt to reduce user cost brings an increase in the direct costs of rebuilding. So there is a clear trade-off between reducing direct costs and mitigating the costs to travellers and economic activities. The object of this paper is to allow the evaluation of the delay that is suffered by the users of two-lane freeways when only one lane is available. The delays for different flow levels and different lengths of the reconstruction area are evaluated with the use of a tailored new developed microscopic traffic simulation model.
Transportation Research Record, 2001
Interest in the temporal modeling of road traffic has increased over the past decade due to the n... more Interest in the temporal modeling of road traffic has increased over the past decade due to the need to model traffic dynamics for the purpose of evaluating a variety of ITS components, such as traffic control measures and route guidance. A number of different approaches are available, including macroscopic, mesoscopic and microscopic traffic models, as well as analytical dynamic assignment models. Although microscopic models are the most detailed and realistic, they are difficult to calibrate and may not be the most practical tools for large-scale networks. This paper investigates three methods for dynamic network loading that are considerably less detailed than microscopic modeling. Each of the three methods is based on a different approach to modeling traffic dynamics: link-based travel time functions, the celltransmission model, and a link-based model derived from a simplified car-following relationship. A small test network was devised and the results from each model were compared to those obtained with a microsimulator . Interpretation of the discrepancies observed in the results gave some indication of the relative importance of the different components of the three traffic models presented.
Proceedings of 2014 IEEE International Conference on Service Operations and Logistics, and Informatics, 2014
ABSTRACT This article show a methodology for the identification of road anomalies through the cou... more ABSTRACT This article show a methodology for the identification of road anomalies through the coupled measurements of vertical acceleration and sound pressure levels. The innovative solution of this methodology lays in the possibility to evaluate road anomalies by using the time derivative of acceleration and sound pressure. Furthermore, this methodology has been developed and validated using a commercially available instrumentation possessed by most drivers, such as, smartphones and tablets. The current smartphone devices, in fact, are equipped with GPS, gyroscope and microphone that allow to simultaneously record data relating to geolocation, acceleration and sound pressure. The widespread distribution of this equipment could allow local administration to acquire a large number of surveys carried out by normal drivers and build a large Data Base on road anomalies representative of a whole network of infrastructures with a very small cost. Finally, the application of the methodology overturns current monitoring policies of road infrastructure that can be carried out only by the management staff by crowdsourcing the DB system with continuous real time updates brought by normal road users.
In this paper the problem of defining the analytical rules that govern flows at an intersection n... more In this paper the problem of defining the analytical rules that govern flows at an intersection node is addressed. This problem pertains to flow based Dynamic Network Loading (DNL) models that consider the spill-back of queues. The limited resource of flow supply on the downstream links, of such a node, has to be distributed between users in a proper way. The problem can be expressed as a linear programming problem, where the objective is to maximize the total flow crossing the node at each time t, and the constraints are the local supplies and demands at the node.