Search results for "Strade"

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…

Criteri e studi di progetto per il trattamento con calce dei terreni fini di scavo

2009

A behavioural model to evaluate the delay on urban traffic flows and analysis of environmental implications

2014

This paper deals the problem of a road's capacity in presence of perturbations in the vehicular flow. In particular, among the different causes of delay, is here the presence of vehicles parked along the road in relation at their parking activity. Preliminarily is evaluated the delay, caused by each vehicle that leaves its parking position and enters in the traffic flow or by that who slows down the flow to enter in the parking, by introducing these effects in the equations of flow, it is possible to evaluate the modifications that the same curves of down flow suffer. Consequently, it is also possible to evaluate the increase of pollutant emissions.

Lo studio delle criticità d'esercizio nella rete ferroviaria, a causa di ostacoli di forme diverse, attraverso problemi geometrici di tipo Laplace

2010

Le normali condizioni di funzionamento della rete ferroviaria possono essere talvolta compromesse in esercizio da situazioni particolari che non consentono, a causa di ostacoli lungo la linea, l’ordinaria circolazione dei mezzi. In tali condizioni di criticità, occorre allora opportunamente individuare appositi itinerari alternativi per assicurare con efficacia l’effettuazione del servizio del trasporto al previsto recapito finale, per ciascuna delle relazioni Origine-Destinazione O-D interessate dall’evento esaminato. Dal punto di vista metodologico il problema è stato affrontato facendo ricorso alla teoria delle probabilità geometriche. Si è considerato il grafo rappresentativo della rete…