Today, local administrations are faced with the presence of greater constraints in terms of the u... more Today, local administrations are faced with the presence of greater constraints in terms of the use of space and time. At the same time, large amount of data is available to fleet managers that can be used for controlling their fleets. This work is set in the context defined by sustainable city logistics, and information and communication technologies (ICTs), to formalize the three themes of the smart city (transport, ICTs and energy savings) in a single problem. Following this, the main purpose of the study is to propose a unified formulation of the basic problem of fleets, i.e., the traveling salesman problem (TSP), which explicitly includes the use of emerging information and communication technologies (e-ICTs) pointing out the learning process of path costs in urban delivery. This research explores the opportunity to extend the path cost formation with a within-day and day-to-day learning process, including the specification of the attributes provided by e-ICTs. As shown through...
Traditional and innovative on-demand transport services, such as taxi, car sharing or dial-a-ride... more Traditional and innovative on-demand transport services, such as taxi, car sharing or dial-a-ride respectively, can provide a level of flexibility to the public transport with the aim to guarantee a better service and to reduce the exploitation costs. In this context, in order to point out the key-factors of on-demand services, this study focuses on traditional on-demand service (such as taxi one), and presents the results of a demand analysis and modelling, obtained processing taxi floating car data (FCD) available for the city of Rome. The GPS position of each taxi is logged every few seconds and it was possible to build a monthly database of historical GPS traces through around 27 thousands of GPS positions recorded per day (more than 750 thousands for the entire month). Further, the patterns of within-day and day-to-day service demand are investigated, considering the origin, the destination and other characteristics of the trips (e.g. travel time). The time-based requests for t...
Within the Advanced Traveller Information System (ATIS), the Advanced Traveler Advisory Tools (AT... more Within the Advanced Traveller Information System (ATIS), the Advanced Traveler Advisory Tools (ATAT) are able to assist travellers in multiservice and multimodal networks, to suggest to each user the best paths. Some of these tools, in order to find the best personal paths assign, within the Random Utility Theory framework, an estimate of the utility perceived by user to each path alternative (Arentze, 2013 and Nuzzolo et al., 2013a). This personal perceived utility is function of several attributes (e.g. total travel time, walking time) and of model parameters that depend on user personal preferences. Thus, the parameters of an individual path choice model have to be estimated, for example through a Stated Preference (SP) survey: each new user is several times provided with some alternative paths; among them, he has to choose the perceived best one. Besides, the new opportunities given by crowdsourcing systems, with the possibility to trace the single traveller, as for example Waze...
17th International IEEE Conference on Intelligent Transportation Systems (ITSC), 2014
ABSTRACT This paper focuses on an Advanced Traveler Advisory Tool (ATAT) aiming at supporting use... more ABSTRACT This paper focuses on an Advanced Traveler Advisory Tool (ATAT) aiming at supporting users travelling on multimodal networks and at suggesting the best path set according to user personal preferences. In order to find the best personal paths, the presented ATAT uses the Random Utility Theory framework to assign an estimation of the path utility perceived by the user for each path alternative. The first part of this paper illustrates the user needs and the ATAT logical architecture, and presents the modeling framework able to provide personalized pre-trip and en-route information. The second part reports the results of some test applications and the results of a benefit assessment of the ATAT use for transit travelers.
17th International IEEE Conference on Intelligent Transportation Systems (ITSC), 2014
ABSTRACT Bi-directional communication among travelers and info center and transport network “big ... more ABSTRACT Bi-directional communication among travelers and info center and transport network “big data” collecting and processing seem to be two new factors that can improve the tools that support network short-term forecasting for transit operations control and traveler advising. Some of these tools, with several methodological issues connected to their development, are analyzed over the paper.
Today, local administrations are faced with the presence of greater constraints in terms of the u... more Today, local administrations are faced with the presence of greater constraints in terms of the use of space and time. At the same time, large amount of data is available to fleet managers that can be used for controlling their fleets. This work is set in the context defined by sustainable city logistics, and information and communication technologies (ICTs), to formalize the three themes of the smart city (transport, ICTs and energy savings) in a single problem. Following this, the main purpose of the study is to propose a unified formulation of the basic problem of fleets, i.e., the traveling salesman problem (TSP), which explicitly includes the use of emerging information and communication technologies (e-ICTs) pointing out the learning process of path costs in urban delivery. This research explores the opportunity to extend the path cost formation with a within-day and day-to-day learning process, including the specification of the attributes provided by e-ICTs. As shown through...
Traditional and innovative on-demand transport services, such as taxi, car sharing or dial-a-ride... more Traditional and innovative on-demand transport services, such as taxi, car sharing or dial-a-ride respectively, can provide a level of flexibility to the public transport with the aim to guarantee a better service and to reduce the exploitation costs. In this context, in order to point out the key-factors of on-demand services, this study focuses on traditional on-demand service (such as taxi one), and presents the results of a demand analysis and modelling, obtained processing taxi floating car data (FCD) available for the city of Rome. The GPS position of each taxi is logged every few seconds and it was possible to build a monthly database of historical GPS traces through around 27 thousands of GPS positions recorded per day (more than 750 thousands for the entire month). Further, the patterns of within-day and day-to-day service demand are investigated, considering the origin, the destination and other characteristics of the trips (e.g. travel time). The time-based requests for t...
Within the Advanced Traveller Information System (ATIS), the Advanced Traveler Advisory Tools (AT... more Within the Advanced Traveller Information System (ATIS), the Advanced Traveler Advisory Tools (ATAT) are able to assist travellers in multiservice and multimodal networks, to suggest to each user the best paths. Some of these tools, in order to find the best personal paths assign, within the Random Utility Theory framework, an estimate of the utility perceived by user to each path alternative (Arentze, 2013 and Nuzzolo et al., 2013a). This personal perceived utility is function of several attributes (e.g. total travel time, walking time) and of model parameters that depend on user personal preferences. Thus, the parameters of an individual path choice model have to be estimated, for example through a Stated Preference (SP) survey: each new user is several times provided with some alternative paths; among them, he has to choose the perceived best one. Besides, the new opportunities given by crowdsourcing systems, with the possibility to trace the single traveller, as for example Waze...
17th International IEEE Conference on Intelligent Transportation Systems (ITSC), 2014
ABSTRACT This paper focuses on an Advanced Traveler Advisory Tool (ATAT) aiming at supporting use... more ABSTRACT This paper focuses on an Advanced Traveler Advisory Tool (ATAT) aiming at supporting users travelling on multimodal networks and at suggesting the best path set according to user personal preferences. In order to find the best personal paths, the presented ATAT uses the Random Utility Theory framework to assign an estimation of the path utility perceived by the user for each path alternative. The first part of this paper illustrates the user needs and the ATAT logical architecture, and presents the modeling framework able to provide personalized pre-trip and en-route information. The second part reports the results of some test applications and the results of a benefit assessment of the ATAT use for transit travelers.
17th International IEEE Conference on Intelligent Transportation Systems (ITSC), 2014
ABSTRACT Bi-directional communication among travelers and info center and transport network “big ... more ABSTRACT Bi-directional communication among travelers and info center and transport network “big data” collecting and processing seem to be two new factors that can improve the tools that support network short-term forecasting for transit operations control and traveler advising. Some of these tools, with several methodological issues connected to their development, are analyzed over the paper.
Transport Interaction Models – The Transpace Model, 2016
In transport geography, the key role of freight traffic has often been unnoticed. On the other ha... more In transport geography, the key role of freight traffic has often been unnoticed. On the other hand, studies of freight mobility traditionally focus only on restocking flows and neglect the linkage with shopping activities, ignoring in this way the impact that freight flows have on location of freight facilities (e.g. warehouses, distribution centres) and shops, and on end consumer’s shopping choices. Starting from these considerations, the paper presents a method to simulate and assess spatial scenarios able to optimize city sustainability and meet the interests of end-consumers and freight operators. In particular, the paper provides insights on the interrelations among the distribution of freight facilities, shopping mobility and location of freight facilities by presenting a system of simulation models. The results of an application of this method to a test site are also reported and discussed.
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Starting from these considerations, the paper presents a method to simulate and assess spatial scenarios able to optimize city sustainability and meet the interests of end-consumers and freight operators. In particular, the paper provides insights on the interrelations among the distribution of freight facilities, shopping mobility and location of freight facilities by presenting a system of simulation models. The results of an application of this method to a test site are also reported and discussed.