Search results for " traffic"
showing 10 items of 384 documents
Calibration of Speed-Density Relationships for Freeways in Aimsun
2014
The first application of a calibration methodology which uses speed-density relationships in the microsimulation calibration process is described in this article. Traffic patterns were implemented developing speed-density relationships for empirical and simulated data. For empirical relationships reference was made to traffic data observed at A22 Freeway (Italy). Aimsun microscopic traffic simulator software was then used to obtain analogous relationships for a test freeway segment under uncongested traffic conditions. Thus on field conditions were reproduced varying some calibration parameters until a good matching between field and simulation was achieved. The closeness between empirical …
ROAD SAFETY PERFORMANCES FROM MICRO-SIMULATION CONSIDERING AUTONOMOUS VEHICLES OPERATIONS
2019
Introduction of Autonomous Vehicles in road traffic will remove the impact of the human factor from the driver’s decision-making process, and will transform the criteria for road network design, road infrastructure administration, traffic modeling and assessment tools for road safety management. The paper presents a microsimulation-based approach for safety performance evaluation of roundabouts where different percentages of Autonomous Vehicles are mixed with Conventional Vehicles. The simulated vehicle trajectories exported from VISSIM were used as a basis to estimate traffic conflicts through the Surrogate Safety Assessment Model (SSAM) for a sample of European roundabouts. In order to be…
EMISSIONI INQUINANTI PRODOTTE DAL TRAFFICO VEICOLARE: MODELLIZZAZIONE E INTERVENTI DI BEST PRACTICES PER MIGLIORARE LA QUALITA’ AMBIENTALE
L’inquinamento atmosferico continua a essere un’emergenza e uno dei maggiori fattori di rischio ambientale per la salute umana. L’impiego nel campo della ricerca, in quello della tecnologia dei mezzi di trasporto, la razionalizzazione del modal split nel contesto urbano, l’inasprimento della normativa nell’accettazione di veicoli vetusti o scarsamente soggetti a manutenzione hanno fatto si che le emissioni di molti inquinanti atmosferici siano diminuite in modo sostanziale negli ultimi anni, determinando una migliore qualità dell’aria ambiente. Nonostante questo, per la complessità del fenomeno inquinamento atmosferico che comporta l’ormai ben nota mancanza di relazione lineare tra emission…
Alcuni elementi riguardanti i modelli di simulazione del traffico
2014
PARKING PRICING FOR A SUSTAINABLE TRANSPORT SYSTEM
2014
The purpose of this study has been to develop a model to designing an efficient parking pricing policy. The aim is an intelligent control and management system of parking pricing integrated with a redefinition of the circulation scheme to define a limited traffic zone in the central business district of Palermo. The transport demand over the entire area of the town has been studied in order to design various parking pricing scenarios with the application of an additional cost on parking inside the selected area of the CBD. This area attracts most of the private vehicular traffic and it is characterized by university faculties, schools, hospitals, offices and commercial areas. The optimal ho…
TECNICHE QUANTITATIVE PER LA PROGETTAZIONE DELLA TARIFFAZIONE DELLA SOSTA IN AMBITO URBANO
Ad oggi numerose resistenze dibattono sull’adozione di schemi di pricing nei centri urbani dalla presunta iniquità, che renderebbero di fatto accessibili i centri urbani soltanto a coloro che possono permettersi di pagare la tariffa di accesso. Ma al contempo l’evoluzione di tecnologie innovative di rilevamento e di infomobilità consentono di ipotizzare un completo ribaltamento dei criteri di tassazione del traffico stradale, dove il carico fiscale potrebbe essere rimodulato in relazione agli effettivi comportamenti di ogni singolo utente. L’obiettivo è stato quello di controllare e limitare la mobilità all’interno di una determinata area urbana attraverso un nuovo modo di concepire le ZTL …
Criteri di modellizzazione di reti stradali: il caso mondello
2011
Gli architetti e la città antica: “Cominciamo con mini-isole”
2007
Parere sulla mobilità pedonale nel centro storico di Palermo e sulla riduzione del traffico privato
The Lean Urban Policies’ Design A values-centered method for sustainable urban planning.
In these past years, the necessity and urgency has emerged for policies tied to an alternate development to be efficiently applied, and not limited to single operations. The policies must be defined by a clear and effective method of action. Starting by investigating what are the relationship among human being, built environment and natural sources, in fact, we think it is possible to enrich the sustainable urban planning policies with new contents and possibly, new tools. By describing the frame, the objective is to define the most effective method, to be able to convey an effective project action and governance for the territory, to achieve predefined social and energy based objectives. …
A Network Tomography Approach for Traffic Monitoring in Smart Cities
2018
Traffic monitoring is a key enabler for several planning and management activities of a Smart City. However, traditional techniques are often not cost efficient, flexible, and scalable. This paper proposes an approach to traffic monitoring that does not rely on probe vehicles, nor requires vehicle localization through GPS. Conversely, it exploits just a limited number of cameras placed at road intersections to measure car end-to-end traveling times. We model the problem within the theoretical framework of network tomography, in order to infer the traveling times of all individual road segments in the road network. We specifically deal with the potential presence of noisy measurements, and t…