Search results for "Ferro"
showing 10 items of 2451 documents
Infrastrutture viarie e territorio. Innovazione rispetto al contesto ambientale.
2009
Notiziario della SIIV su Le Strade
A markovian model as a tool for optimization of maintenance planning on the railway lines
2008
This paper is designed to develop a procedure which defines a planning criterion for railway superstructure maintenance by means of Markov decision processes. This methodology allows to formulate a specific policy π which carries out the best configuration of budget allocation (min. Ф), and at the same time to guarantee the highest efficiency level in the railway superstructure. Thanks to the dynamic programming technique applied to decision processes, the report has examined the possibility of establishing the best management policy in order to maintain adequate safety levels of implementation and quality speed levels, in the presence of budget constraints, thus optimizing the available re…
Evaluation of motorway reliability based on the identification of spot speed stochastic processes. The case of A22 motorway, Italy
2012
The evaluation of motorway reliability is a subject of great interest for researchers of traffic engineering. For easy recognizable reasons, this subject is very important in theoretical studies and for applications, e.g. evaluation of capacity and traffic control on motorway. In this paper the different conceptions of reliability in technical and scientific literature are compared with the following definition: reliability of traffic stream, for a time interval T, is “the conditioned probability that level of speed spot process does not decrease during T as far as the section in which limit density is reached, given that the level at instant zero is equal to the average speed corresponding…
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…
L'interazione utente-strada. A nAPOLI IL WORKSHOP "HUMAN CENTERED INFRASTRUCTURE DESIGN"
2009
Notiziario della SIIV su Le Strade
Multidisciplinary Road Safety . A Enna un corso avanzato sulla sicurezza stradale
2009
Notiziario della Società Italiana di Infrastrutture Viarie (SIIV) sulla rivisa Le Strade
Normativa, tecnica, innovazione.
2009
Notiziario della SIIV sulla rivista Le Strade.
Sistema tramviario di Palermo: sicurezza e qualità degli spazi pubblici
2017
A Palermo con l’approvazione, nel 2002, del “Piano Integrato per il Trasporto Pubblico”1, si è dato avvio alla realizzazione di diverse opere finalizzate a migliorare il servizio pubblico di trasporto urbano che in un futuro ormai prossimo rivoluzioneranno la connessione tra le diverse parti della città. In particolare, il contributo intende soffermarsi su alcuni aspetti riguardanti il Sistema tram di Palermo, di cui, recentemente, sono già state realizzate le prime quattro linee ed è volontà dell’Amministrazione comunale di dotare la città di ulteriori tratte in tempi brevi. Da un’analisi del sistema tramviario di Palermo appare chiaro che, pur presentando alcuni vantaggi dal punto di vist…